Photo: Reuters

An explosive device has been made safe in a flat in St. Petersburg by Russian police, three days after a suspected bomber on the city’s metro killed 13 people.

A city official said several suspects were held when police raided the flat early on Thursday, Ria Novosti said.

Neighbours were moved away and witnesses said three men were led out in handcuffs, the news agency added.

The main suspect in the metro bombing, Akbarzhon Jalilov, died in the attack.

Aged 22 and from the Central Asian republic of Kyrgyzstan, his remains were identified by his parents on Wednesday.