Barely three weeks after an under-construction bridge over the Ganga collapsed in Bihar's Khagaria district, a portion of another bridge in Kishanganj district caved-in on Saturday, an official said.

In the incident, which took place around 400 km from state capital Patna, a pillar of the bridge over river Mechi collapsed, said Arvind Kumar, project director of National Highway Authority of India (NHAI).