Met Police have released an image of a man they wish to trace following two separate incidents on buses in north west London.
Police said that both incidents happened within minutes of each other in the Cricklewood area on Tuesday, 20 April.
At around 12:45hrs a woman, aged in her 20s, was on the top desk of a route 332 bus outside Cricklewood bus garage.
The suspect approached her and, without warning, shouted at her and threw a drink he was holding over her. He then got off the bus.
Around 15 minutes later on another route 332 bus in Alder Grove, NW2, the same man approached a male who was sitting on the top deck.
The suspect intimated he had a knife, made verbal threats and demanded the male hand over his mobile telephone. The suspect then left the bus.
The suspect is described as a black male of large build, approximately 6ft 2inches tall with a beard. He was wearing a long black coat, a red and white scarf and was carrying a backpack.
PC Matt Cannon of the Brent Safer Transport Team said: “Thankfully no-one was physically hurt but both victims were left understandably shaken by these incidents.
“I would appeal to anyone who recognises this man to get in contact with police immediately.
“Also, if you were on either bus and witnessed what happened then please get in touch as your information could help progress this investigation.”
If you can help, please contact police on 101 or tweet @MetCC and quote CAD 4855/20Apr. Alternatively, you can provide information anonymously to the independent charity Crimestoppers on 0800 555 111.
Source: Met Police