Dr emil chynn was one of the first medics at the scene when the first plane crashed into the twin towers at just after 9am on september 11 2001.
Twin towers roof rescue.
Cbs news photojournalist mark laganga captured the eerie scene up close.
Hovering just 300ft above one of the twin towers the camera peers down on to the burning roof and captures the thick clouds of black smoke billowing out after the planes have gone in.
The rescue effort continued round the clock.
Fbi agents firefighters rescue workers and engineers work at the pentagon crash site on september 14 2001 where a hijacked american airlines flight slammed into the building on september 11.
Clovis california ksee kgpe wednesday marks 18 years since nearly 3 000 lives were lost in the terrorist attacks on sept.
The roof of the south tower said hayes was totally obscured.
Pasquale buzzelli a survivor who claims to have been on the 22nd floor of one of the collapsing towers lived through the fall with only minor injuries.
Genelle guzman mcmillan another survivor.
The california 9 11 memorial in clovis will unveil a m.
Only 29 minutes passed between the two world trade center towers falling.
Rare video from ground zero on 9 11.
But the doors to the roof were kept locked because a similar rescue in 1993 when a bomber tried to destroy the towers was slammed as a publicity stunt by fire bosses and the port authority which owned the centre the wall street journal.
And 2 world trade center at 1 362 feet 415 1 m.
In one of the buildings police helicopters could have landed on the roof to take people to safety.