BBC NEWS: "Demonstrators have occupied the UK Immigration Service headquarters on the south side of Glasgow.
About 30 protesters, including Socialist MSP Tommy Sheridan and Nationalist MSP Sandra White, are taking part in the blockade.
The campaigners, angry at the use of dawn raids to deport failed asylum seekers, said they intended to close the centre for 12 hours.
Police said chains appeaed to have been used to block the doors of the office.
The centre was targeted because it is where asylum seekers are required to sign on.
One of the Birmingham Six, Paddy Hill, and film director and actor Peter Mullan are among the protesters.
The Reverend Iain Whyte, of the Iona Community, compared dawn raids to the policies of the apartheid regime in South Africa.
Robina Qureshi, director of Positive Action in Housing, said the protest was to highlight the 'inhumanities perpetrated' by the Home Office.
She added: 'The Home Office's practices on Scottish soil are now causing international embarrassment.
'What's clear right now is that things can't go on as they are.'
A police spokeswoman said nearly 30 protesters had blocked the entrance of the offices.
She continued: 'It seems that members of the group have used chains to block doors to the premises.'
About 200 campaigners, including asylum seekers, staged a protest in Glasgow against dawn raids in September.
The show of strength came days after a dawn raid on the Glasgow home of a failed asylum seeking Kosovan family.
The Vucaj family had been arrested and taken to the Yarlswood Centre in Bedfordshire, before being deported.
The five members of the family, including three children, had lived in Scotland for five years."
