LONDON (Reuters) - British police searched a property in Manchester on Thursday in connection with a suicide bombing which killed 22 people in the northern English city last month and released another three people without charge.

A total of six men remained in police custody for questioning over the attacks at the Manchester Arena. Fifteen people have been released without charge.

The attacker Salman Abedi was radicalised in 2015 while living in Britain, his brother told Libyan counter-terrorism investigators in Tripoli.

Police were on heightened alert as millions of people voted on Thursday in Britain’s parliamentary elections just days after three attackers killed eight people in London.