Police in Britain on Sunday said they arrested five men suspected of"terrorism offenses." Four of the men are Iranian.

The nationality of the fifth man is yet to be established.

The five men, aged between 29 and 46, were arrested in London, Swindon, and the Greater Manchester area on allegations related to "a suspected plot to target a specific premises," London's Metropolitan Police said in a statement.

The men, arrested on suspicion of "preparation of a terrorist act," remain in custody, the police said.

"This is a fast-moving investigation and we are working closely with those at the affected site to keep them updated," said Metropolitan Police counter-terrorism chief Dominic Murphy.

"The investigation is still in its early stages and we are exploring various lines of enquiry to establish any potential motivation as well as to identify whether there may be any further risk to the public linked to this matter," he said.

The police are carrying out searches in the Greater Manchester, London and Swindon areas in connection with the investigation.

Edited by: Sean Sinico