Flowers are laid by an officer from Police Scotland outside the Church of Our Lady, Star of the Sea, ahead of the funeral of Manchester bomb victim Eilidh MacLeod, in Castlebay on the island of Barra, in Scotland June 5, 2017. REUTERS/Andrew Milligan/Pool

LONDON (Reuters) - British police arrested two 20-year-old men in Manchester on Wednesday in connection with last month’s suicide bombing that killed 22 children and adults attending a concert by U.S. singer Ariana Grande, police said on Wednesday.

One was arrested overnight when police searched an address in the city, while the other presented himself voluntarily at a police station.

A total of 21 people have been arrested so far in the investigation into the suicide bombing. Twelve were released without charge and nine remain in custody.