Police on Saturday released without charge five men who were arrested a week earlier as part of an investigation into international terrorism.

The men were handed over to the custody of the immigration service, London's Metropolitan Police (search) said.

They were arrested Oct. 8 along with five others, all of whom have since been released.

Police said at the time of the arrests that the men — picked up at properties in Derby and Wolverhampton (search), in England's Midlands region, and in Croydon, south London — had been detained "on suspicion of the commission, preparation or instigation of acts of terrorism."

They said the arrests had not been related to the bombings in London in July, but were made as part of an ongoing investigation involving police and security service MI5.