A 21-year-old man arrested in Hounslow on Sept. 16 and a 48-year-old man arrested in Newport on Sept. 20 were released by the police with no further action, the police said in a statement, Reuters reported.
“We have four males in custody and searches are continuing at four addresses. Detectives are carrying out extensive inquiries to determine the full facts behind the attack,” the police said.
A homemade bomb exploded Sept. 15 during the morning rush hour on a packed underground Tube train at Parsons Green station, sending flames through the carriage, Reuters reported.
It was the fifth major militant incident in Britain this year.
The Islamic State militant group claimed responsibility for the latest attack.
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