A third man suspected over Thursday 's suicide bombing in London was arrested Sunday, the Sky news reported.

The man has been arrested in south London under anti-terrorist act. The man has been taken to central London for questioning Sunday evening. No further details were given.

Images of the four men who were suspected of carrying out the four bombings in London's three tube stations and a bus were captured by close-circuit televisions and released Friday when a fifth suspect, a 27-year-old Brazilian, was killed mistakenly at a tube station by plain-clothes armed police.

Scotland Yard say they have received a good response from London citizens to their appeal for information over the men.

The suspects are believed to have tried to detonate three bombs on three underground stations and one on a bus in different locations of London.

The police was caught in a difficult situation when they announced Saturday that the man shot by armed police in south London was not connected with the bombings.

Referring the incident as "a tragedy" which will be investigated, Ian Blair, chief commissioner of the Metropolitan Police added that such cases could happen as police hunt suspected suicide bombers.

The Brazilian foreign ministry has demanded an explanation of the death of its citizen.

Source: Xinhua