FBI questions 5 after New York explosion that injured 29

FBI agents are questioning five people over the explosion that injured 29 people in a crowded Manhattan neighbourhood.

Authorities have questioned several people as they examine whether there is a connection between an explosion that rocked a crowded New York City neighbourhood, an unexploded pressure-cooker device found streets away, an earlier pipe bomb blast in New Jersey or explosive devices found across the state near a train station.

On Sunday night, FBI agents stopped "a vehicle of interest in the investigation" of the Manhattan explosion, according to FBI spokeswoman Kelly Langmesser.