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Two men arrested in connection with the explosion at Parsons Green Tube station have been released without charge, police say.

The men, aged 21 and 48, were arrested in Hounslow, west London on Saturday and Newport, south Wales, on Wednesday.

Four other people - aged 17 to 30 and arrested in south Wales and Dover - remain in police custody.

Thirty people were injured on Friday when a bomb partially exploded on a rush-hour District line train.

The 21-year-old man who was released is believed to be Yahyah Farroukh from Syria.

As well as continuing to question those held, police are searching properties in Newport, Thornton Heath in south London, and Surrey.

Commander Dean Haydon, head of the Met Counter Terrorism Command, said: "We anticipate that the searches will take some days to complete and may cause further disruption.

"However, it is important that we continue with these searches and I'd like to thank all those affected for their support, patience and cooperation."

He added: "As police and our partners do all we can to confront the threat, public vigilance remains as vital as ever."

He urged the public to report anything unusual to the police.

Westminster Magistrates' Court granted police permission to continue questioning two of the remaining men, both arrested in Wales, until Tuesday.