Justin Bieber is presently trapped in a "possible riot situation" in Liverpool.

The 'Baby' singer's hotel in the English city was surrounded by hordes of screaming fans by six pm this evening.

This prompted the police to warn him not to approach his balcony at The The Hard Days Night Hotel to greet them or he will have to be arrested as it could lead to a riot, according to website TMZ.

Justin is scheduled to play in the city's ECHO arena tomorrow night (10.03.11).

Earlier this afternoon the heartthrob posted a picture from his hotel and tweeted: "This is crazy. There are like thousands of people out there.

"Love everybody but gonna try and get some sleep. Please don't scream. Lol (sic)"

He added half an hour later: "THIS IS CRAZY!"

Liverpool- famous as the birthplace of The Beatles, the original pop band to be greeted by screaming teenage fans, said to be struck down with 'Beatlemania' - was brought to a standstill by Justin's fans, known as 'Beliebers', who took to twitter to share their excitement.

User beckylaurenrees posted: "OMG. My auntie who lives there saw bieber coming out like an hour ago and rang me hahaha (sic)."

Another fan, going by the name bieberdivaz tweeted: "CROWD CHANTING "JUSTIN BIEBER" OUTSIDE LIVERPOOL HOTEL RIGHT NOW! (sic)"