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A general view of the scene shortly after a helicopter crashed in the Vauxhall area of central London, after hitting a crane on top of a tower block by the River Thames, according to eye witness reports, Wednesday Jan. 16, 2013. (AP Photo / Toby Scott, PA)

A stills grab from television footage taken by a member of the public shows flames on a road following the crash of a helicopter in central London, on January 16, 2013. Two people were killed when a helicopter hit a crane at a building site in central London and plunged to the ground on Wednesday, police said. NIC WALKER/AFP/Getty Images

Smoke pours from the burning debris of a helicopter which crashed in the Vauxhall area, January 16, 2012 in London, England. The helicopter appeared to hit a crane attached to the nearby St Georges Wharf Tower before plunging into the road below during the morning rush hour. (Photo by Victor Jimenez/Getty Images)

A collect picture taken by a member of the public shows flames on a road following the crash of a helicopter in central London, on January 16, 2013. Two people were killed when a helicopter hit a crane at a building site in central London and plunged to the ground on Wednesday, police said. NIC WALKER/AFP/Getty Images

Remnants of a helicopter which crashed onto a construction crane is seen on the ground by a burnt out car in London, Wednesday, Jan. 16, 2013. The helicopter crashed into a crane and fell on a crowded street in central London during rush hour Wednesday, sending black plumes of smoke into the air as it smashed to the ground. The pilot and one person on the ground were killed and 13 others injured, officials said. (AP Photo/Sang Tan)

The damaged crane is seen on the St George's Tower at Vauxhall in London January 16, 2013. A helicopter crashed into a crane on top of one of Europe's tallest residential blocks in central London on Wednesday, killing two people as it burst into flames and threw plumes of smoke into the foggy air. REUTERS/Dylan Martinez

Smoke from a burning helicopter which crashed rises above Vauxhall in central London January 16, 2013. A helicopter crashed into a crane on top of one of Europe's tallest residential blocks on Wednesday, killing two people as it burst into flames and threw plumes of smoke into the foggy air above central London. REUTERS/Victor Jimenez via Twitter/handout

Debris from a crashed helicopter is seen in Vauxhall, London January 16, 2013. A helicopter crashed into a crane on top of one of Europe's tallest residential blocks in central London on Wednesday, killing two people as it burst into flames and threw plumes of smoke into the foggy air. REUTERS/Neil Hall

Smoke billows from the scene following a helicopter crash in central London, after it hit a crane on St. George's Tower building in the Vauxhall area of central London, Wednesday Jan. 16, 2013. Police say two people were killed when a helicopter crashed during rush hour in central London after apparently hitting a construction crane on top of a building, obscured behind smoke. (AP Photo/Max James Tolhurst, PA)

Debris lies on the ground after a helicopter crashed into a construction crane on top of St George's Wharf tower building, in London, Wednesday Jan. 16, 2013. Police say two people were killed when a helicopter crashed during rush hour in central London after apparently hitting a construction crane on top of a building. (AP Photo/Vince Pol)

A bird flies through the mists near the damaged crane on the St George's Tower at Vauxhall in London January 16, 2013. A helicopter crashed into a crane on top of one of Europe's tallest residential blocks in central London on Wednesday, killing two people as it burst into flames and threw plumes of smoke into the foggy air. REUTERS/Dylan Martinez

A broken section from a crane is seen lying on the pavement in a road at Vauxhall in London January 16, 2013. A helicopter crashed into a crane on top of one of Europe's tallest residential blocks in central London on Wednesday, killing two people as it burst into flames and threw plumes of smoke into the foggy air. REUTERS/Dylan Martinez

A destroyed car is seen near debris from a burning helicopter which crashed in central London January 16, 2013. A helicopter crashed into a crane on top of one of Europe's tallest residential blocks on Wednesday, killing two people as it burst into flames and threw plumes of smoke into the foggy air above central London. REUTERS/London Fire Brigade/handout

Emergency services at the scene after a helicopter reportedly collided with a crane attached to St Georges Wharf Tower in Vauxhall, on January 16, 2013 in London, England. According to reports, the helicopter hit the crane before plunging into the road below during the morning rush hour. (Photo by Oli Scarff/Getty Images)

A damaged crane attached to St Georges Wharf Tower after a helicopter collided with it, in Vauxhall, on January 16, 2013 in London, England. According to reports, the helicopter hit the crane before plunging into the road below during the morning rush hour. Two people died and nine casualties have been confirmed with one in a critical condition. (Photo by Dan Kitwood/Getty Images)

A damaged crane that was hit by a helicopter is pictured following the crash in central London on January 16, 2013. Two people were killed after a helicopter hit a crane at a building site and plunged to the ground in a ball of flames, police said. CARL COURT/AFP/Getty Images

A pictures shows The Tower at St George Wharf development after a helicopter hit a crane at the construction site of the apartment block in central London on January 16, 2013. Two people were killed after a helicopter hit a crane at a building site and plunged to the ground in a ball of flames, police said. CARL COURT/AFP/Getty Images

A damaged crane that was hit by a helicopter is pictured following the crash in central London on January 16, 2013. Two people were killed after a helicopter hit a crane at a building site and plunged to the ground in a ball of flames, police said. LEON NEAL/AFP/Getty Images

Debris is pictured in front of a fire engine at the scene of a helicopter crash in central London on January 16, 2013. Two people were killed when a helicopter hit a crane at a building site in central London during morning rush hour and plunged to the ground, engulfing several cars in flames. JUSTIN TALLIS/AFP/Getty Images