Atmosphere at the Apollo Theatre on the streets of Manhattan on February 11, 2012 in New York City.

US singer Whitney Houston performing on ABC's "Good Morning America" in New York City on September 1, 2009.

US singer Cissy Houston (left) and daughter singer Whitney Houston attending the 2010 Keep A Child Alive's Black Ball at the Hammerstein Ballroom in New York City on September 30, 2010.

Whitney Houston holding her Grammy Award for Best Female Rhythm and Blues Vocal Performance for "It's Not Right but It's Okay" at the 42nd Annual Grammy Awards in Los Angeles on February 23, 2000.

Whitney Houston singing at the ceremony dedicating the new Arthur Ashe Stadium at the USTA National Tennis Center at the US Open in Flushing Meadows, NY on August 25, 1997.

Whitney Houston (right) poses with husband, singer Bobby Brown (left) at Eighth Annual Soul Train Music Awards on March 15, 1995

Whitney Houston (C) and her husband Bobby Brown (L) with Israeli Prime Minister Ariel Sharon at his residence in Jerusalem on May 27, 2003

Whitney Houston performing during the 2011 Pre-Grammy Gala and Salute to Industry Icons, with Clive Davis Honouring David Geffen at the Beverly Hilton, Beverly Hill on February 12, 2011

A man walks past an ice covered waterside promenade at Lake Geneva in the city Versoix on early February 5, 2012. The death toll from the vicious cold snap across Europe has risen to more than 260, with the winter misery set to hit thousands of those seeking to escape it as air traffic was hit. AFP PHOTO / FABRICE COFFRINI

Internally displaced Afghan men carry winter supplies at a UNHCR distribution centre in a refugee camp in Kabul on February 9, 2012. Thousands of Afghans in refugee camps in the capital Kabul face a new enemy: an unusually bitter winter that is killing their children. According to official figures at least 15 children have lost their lives in three of about 40 such camps in Kabul from cold over the past month. Residents say the toll is twice as high. AFP PHOTO/ SHAH Marai

A man with child walk past a snow-covered car in central Tbilisi, on February 9, 2012. The temperatures in the Georgia's capital dropped today to -6 C. AFP PHOTO /VANO SHLAMOV

A hiker walks in front of a frozen waterfall on February 07, 2012 in Oberhaslach, eastern France. In France, 41 of the 101 regions were on alert for snow or "deep cold", mainly in the east following the cold snap that has gripped Europe for more than a week. AFP PHOTO/FREDERICK FLORIN

A Bosnian Armed Forces' MI-8 helicopter takes off for an aid flight, in Sarajevo on February 9, 2012. Helicopters ferried food and medicine to villages block by snow today, as Europe's 13-day-old cold snap tightened its frigid grip on the continent. As it has daily since settling over Europe nearly two weeks ago, the brutal cold claimed new lives in several countries, pushing the deadly toll past 450, plus dozens more killed in weather-related accidents. AFP PHOTO / ELVIS BARUKCIC

Workers stand on the deck of the biggest Hungarian icebreaker for rivers the 40-meter-long 'Szechenyi', as it moves and navigates through the ice-covered waters of the Danube River nearby the parliament building in Budapest on February 10, 2012. Hungary closed the Danube to river traffic Friday because of thick ice, bringing shipping to a near standstill on Europe's busiest waterway, as the continent's cold snap death toll reached past 540. "Shipping was ordered stopped overnight Thursday to Friday because of conditions created by icing along the Hungarian part of the river," Istvan Lang, who heads the national technical supervisory body OMIT said. AFP PHOTO / PETER KOHALMI

A Bosnian Armed Forces pilot (L) helps a villager through more than a meter of snow to board a helicopter and be evacuated from the village of Ulog on February 10, 2012. Helicopters ferried food and medicine to snowed-in inhabitants of village Ulog, as Europe's 14-day-old cold snap tightened its frigid grip on the continent, where more than 400 have died as a direct result. Later on Friday one of the Bosnian Armed Forces helicopters (MI 8), flown in a evacuation mission in Eastern Bosnia, emergency landed near a small town of Kalinovik. According to Bosnian Defence Ministry, no passengers or flight crew members were injured. AFP PHOTO/ ELVIS BARUKCIC

Ships lay in a frozen and snow-covered port in Rostock's Warnemuende district, eastern Germany, on February 6, 2012. The deadly cold snap that has gripped Europe for more than a week wrought more havoc across the continent, straining emergency services, grounding flights and pushing the death toll past 300. AFP PHOTO / BERND WUESTNECK

A homeless person is seated near his tent as temperatures plunged to new lows in France, on February 7, 2012 in Reims, northeastern France. A cold snap kept Europe in its icy grip on Thursday, pushing the death toll to 160 as countries from Italy to Ukraine struggled to cope with temperatures that plunged to record lows in some places. AFP PHOTO FRANCOIS NASCIMBENI

A window of the Wendelstein church, Germany's highest church, is covered with frost on the 1.838 meters high Wendelstein Alp mountain near the Bavarian village Bayrischzell on February 8, 2012. Temperatures plunged to new lows in Europe where last two week-long cold snap has now claimed more than 220 lives and forecasters warned that the big freeze would tighten its grip at the next time. AFP PHOTO/CHRISTOF STACHE

A car drives through the snowy landscape on the Grosser Inselberg mountain (916 meters) near Tabarz, eastern Germany, on February 6, 2012. The deadly cold snap that has gripped Europe for more than a week wrought more havoc across the continent, straining emergency services, grounding flights and pushing the death toll past 300. AFP PHOTO / MARTIN SCHUTT

A homeless man rests on a bench in the western Ukrainian city of Lviv on February, 6, 2012.135 people are now confirmed to have died as a result of the cold weather, raising Sunday's toll of 131. Some died on their homes or in hospitals but most froze to death on the streets. AFP PHOTO/ YURIY DYACHYSHYN

This undated handout photo taken by Chinese father He Liesheng and released on February 9, 2012 shows his son running almost naked through the snow along a street in New York city. A home video showing yje four-year-old Chinese boy being forced by his parents to run almost naked through the snow in bitterly cold New York has sparked an online uproar in China. He Liesheng told AFP he was only trying to train his son to be strong and manly, but the footage has ignited debate about the tough parenting style for which China became known after the publication of Amy Chua's book "Tiger Mother". AFP PHOTO / HE LIESHENG

A deserted compound in Butiye village, Moyale district on February 7, 2012. Over 40,000 people in Northern Kenya fled the area following conflicts between Gabra and Borana communities. Photo/BILLY MUTAI

The trail of destruction left at Butiye village in Moyale district February 7, 2012 following conflicts between Gabra and Borana communities. Photo/BILLY MUTAI

Red Cross vehicles in Moyale town on February 10, 2012. Photo/BILLY MUTAI

Funanyata Primary School on February 6, 2012 that was torched following conflicts in the area between Gabra and Borana communities. Photo/BILLY MUTAI

Moyale Boys' Secondary School on February 7, 2012, one of the schools that is yet to open following the clashes between Gabra and Borana communities. Photo/BILLY MUTAI

A deserted Butiye village in Moyale district on February 7, 2012 following conflicts between Gabra and Borana communities. Photo/BILLY MUTAI

A deserted Butiye village in Moyale district on February 7, 2012 following conflicts between Gabra and Borana communities. Photo/BILLY MUTAI

A trail of destruction left at Butiye village in Moyale district February 7, 2012 following conflicts between Gabra and Borana communities. Photo/BILLY MUTAI

A deserted Butiye village in Moyale district on February 7, 2012 following conflicts between Gabra and Borana communities. Photo/BILLY MUTAI

GSU officers patrol Moyale town on February 6, 2012 following clashes between Gabra and Borana. Photo/BILLY MUTAI

A GSU officer patrols Moyale town on February 6, 2012 following clashes between Gabra and Borana. Photo/BILLY MUTAI