Two More Arrested in Britain over Syria Terror Links

British police said Thursday they had arrested two more people over alleged involvement in terrorism in Syria following the discovery of ammunition at the port of Dover.

A man aged 37 and a woman aged 36 were detained at a house in Essex, east of London, on Wednesday following a search and are still being questioned, the Metropolitan Police said.

They were held "on suspicion of being involved in the commission, preparation and instigation of acts of terrorism", it said.

Their arrests came after two men aged 29 and 22, both British citizens, were held on Monday in Dover in southern England after arriving from Calais in France and a quantity of ammunition was seized.

"The arrests relate to suspected terrorism in Syria," the force said.

Police were carrying out searches at premises in east London and in Lancashire, northern England, while two vehicles have also been searched, it said.

"The searches are ongoing and we are unable to provide more details at this stage," it said.

British police have in recent months arrested a number of people on suspicion of travelling to Syria to fight with Islamist rebel groups opposed to President Bashar Assad.

The former head of Britain's domestic intelligence service MI5 warned last year that an increasing number of Britons are heading to the Middle East for terrorist training following the Arab Spring.