An inquiry has been ordered into the collapse of a yet-to-be-inaugurated bridge built over a river in Begusarai district of Bihar, which has brought the spotlight on sub-standard construction works in the state, an official said on Tuesday.

Begusarai District Magistrate Roshan Kushwaha said the bridge over Burhi Gandak, a portion of which gave way and crashed into the river in the early hours of Sunday, had developed cracks a few days earlier.