Updated

The Latest on the bomb explosion on the St. Petersburg subway (all times local):

10:40 a.m.

The parents of the suspected suicide bomber in Monday's deadly explosion on the St. Petersburg subway have arrived in St. Petersburg for questioning.

State-owned Rossiya 24 television on Wednesday showed footage of a middle-aged woman in a red coat and a white headscarf and a man in a black jacket, chased by journalists.

Akbardzhon Dhzalilov, 22, is believed to have moved to St. Petersburg from the Central Asian nation of Kyrgyzstan when he was a teenager.

The bomb went off Monday afternoon as the train was moving between two stations.

One of those stations was closed by a bomb threat Tuesday and again on Wednesday as officials checked for anything suspicious.

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9:55 a.m.

Investigators say they have searched the home of the suspected suicide bomber behind Monday's deadly explosion on the St. Petersburg subway.

The bomb went off on a train under Russia's second-largest city on Monday, killing 14 people and injuring dozens. Investigators said they suspect a 22-year old Kyrgyz-born Russian citizen, Akbardzhon Dzhalilov, of having detonated the bomb.

The Investigative Committee said in a statement in the early hours on Wednesday that the investigators searched the man's home in St. Petersburg. They also examined CCTV footage from outside Dzhalilov's home which shows him leave home with a bag and a backpack.

Another bomb, hidden in a bag, was found and de-activated at another St. Petersburg station just half an hour before the blast. Dzhalilov's DNA was found on the bag.