LONDON (AP) — Three men charged in London's 2005 suicide bombings — Britain's deadliest attack since World War II — were acquitted of the most serious offenses against them Tuesday in the latest terrorism case to frustrate prosecutors.

A jury found Waheed Ali, Sadeer Saleem, and Mohammed Shakil not guilty of conspiring with four suicide bombers who blew themselves up on three subway cars and a bus on July 7, 2005, killing 52 people. Ali and Shakil were convicted of a lesser charge — conspiring to attend a terror training camp — and will be sentenced Wednesday.

The men were the only people ever charged in the attack. A different jury failed to reach a verdict in their case last year.