London - British police have arrested four men on suspicion on preparing acts of terrorism as part of investigations into Islamist-related militancy.
One was detained by armed officers on a London street, police said in a statement.
The men, aged 19, 22, 25 and 27, were arrested in west London and in Thames Valley on Thursday night and Friday morning.
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Armed officers were also present for two of the other arrests but no shots were fired.
The men are now being questioned at a police station in central London and several homes and vehicles were being searched.
The arrests are the latest in a series to have been carried out by British counter-terrorism officers since the country's threat level was raised to its second-highest level in August due to the risks posed by Islamic State fighters returning from Iraq and Syria.