The British police arrested two more persons in connection with the July 21 failed London [Images] bomb attacks after raiding three homes in south London.

Officers with search warrants, supported by armed police, made the arrests on Monday after raiding one address in Clapham and two in Stockwell. The arrests come a day after six persons were nabbed in Sussex in connection with this case.

Police said they were being questioned at a central London station on terror charges. The identity of the arrested persons was yet to be disclosed.

• The London Blasts

In the fast-moving probe, police have now made 20 arrests in connection with the July 21 attacks.

Meanwhile, 27-year-old Osman Hussain, a key suspect in the London bombings, has been charged in Rome with the International Terrorism Act and for possessing false documents.

The move allows the authorities to continue holding Hussain -- also known as Hamdi Isaac -- even as Britain is trying to get him extradited.

Earlier, 24-year old Yasin Hassan Omar, wanted over bomb attempt on a tube near Warren Street, was arrested in Birmingham while Muktar Said Ibrahim, 27, suspected of attempting to bomb a bus in Shoreditch, was taken into custody in north Kensington, London.

Ramzi Mohammed, wanted over failed attempt to bomb a tube near Oval, was arrested in North Kensington in London. Two of Hussain's brothers have also been arrested and questioned by police in Italy [Images].