Speaking to the Evening Standard, commuter David Banks said: "There were just a lot of police around, police vans and cars and officers around a skip. The skip was between one of the exits to the railway station and car park itself."
More top news
The airport said an IT issue meant flight information isn't being displayed correctly. It's trying to fix the problem.
Joe Xuereb is being sought after the women were targeted in Greenwich, south-east London.
Salih Khater has been charged with the attempted murder of members of the public and the attempted murder of police officers.