Two More Arrested in London Bomb Plot

Police investigating the failed July 21 bombing attempts in London said Monday that they had arrested two men during raids in the city.

A total of 23 people have been detained in connection with the attempts, including the four main suspects, who are in police custody in London and Rome.

British transit police dispatched reinforcements from around the country Monday to patrol London’s subway system in a show of force meant to discourage more attacks.

The failed July 21 bombings came two weeks after July 7 attacks that killed 52 people and all four of the suicide bombers. The attacks on each date were aimed at three subway cars and a red double-decker bus, but the July 21 attackers’ explosives failed to detonate.

The men in the arrests announced Monday were detained “on suspicion of the commission, preparation or instigation of acts of terrorism,” a Metropolitan Police spokeswoman said. They were arrested after searches in the Stockwell and Clapham areas of South London.

Security in the Underground was heavy Monday, with officers in bright yellow jackets posted outside many stations.