From the Telegraph (BBC seems down at the moment)
:
Second plane crashes into World Trade Centre
(Filed: 11/09/2001)
A SECOND plane has crashed into the second tower of the World Trade Centre, minutes after an aircraft slammed into the other New York City tower.
An eyewitness said the first aircraft appeared to be a small, private plane which crashed into the top of the tower, near the 107th floor.
The plane slammed into the building and exited the other side. Smoke can be seen billowing from the top floors.
Minutes later, another plane flew straight into the neighbouring twin tower.
It is not clear how many people were on board either plane, nor how many were injured or killed.
The accidents occurred about 9am, New York time, in clear weather