Two men arrested on suspicion of being involved in supplying illegal firearms in connection with the Islamist murder of a British soldier were released on bail Saturday.

The two unnamed men, aged 46 and 42, were arrested on Friday. They have been bailed to return to a south London police station in late June, pending further enquiries.

Michael Adebolajo, 28, a convert to Islam who was shot and injured by police in the May 22 incident, is still being held for questioning over the killing of Lee Rigby and the attempted murder of a police officer.

His fellow suspect Michael Adebowale, 22, was discharged from hospital on Tuesday and charged the following day with murder and possessing a revolver.

The far-right British National Party is holding a march in central London on Saturday. They had originally planned to march in Woolwich in southeast London where Rigby was killed, but police stepped in, fearing it could ignite community tensions.

Events have also been planned in various towns by the anti-Islam English Defence League, while protest group Unite Against Fascism was due to hold a demonstration in Woolwich.

Twelve people have been arrested as part of the probe into Rigby's murder by Scotland Yard's counter-terror branch.

Two women were released without charge and six men accused of conspiracy to murder are out on bail.

Queen Elizabeth II on Friday visited the Royal Artillery Barracks, outside which Rigby was killed, on a long-planned visit.

She marked Rigby's death by meeting privately with some of the officers and soldiers who worked with him, a spokeswoman for Buckingham Palace said.

The victim's family issued an appeal for calm following a number of attacks on mosques and a rise in anti-Muslim incidents since his death.