Students protest at Lib Dem John Hemming's office
John Hemming, MP for Yardley in Birmingham, said the group prevented his team from carrying out essential constituency work.
Birmingham University student Adam O'Connell told Mr Hemming live on BBC WM that his office remained open.
Liberal Democrat MPs signed a pre-election pledge to vote against a rise.
But policy has changed since the formation of a coalition with the Conservatives.'Completely wrong'
MPs are due to vote on Thursday on the coalition plan to raise tuition fees to as much as £9,000.
Mr Hemming told the radio station earlier on Monday that he was on his way to London but the police were at his office.
Protester Mr O'Connell said their protest started with about three people in the office and about five others outside with a banner.
They were letting the public in and out of the office but the police eventually closed the office, leaving some protesters inside, before they all left at about 1500 GMT, he added.
Read the entire story on the BBC website.