Three Rashtriya Janata Dal (RJD) leaders were among four killed in a road accident in Bihar's Araria district on Sunday while they were returning from the wedding of party supremo Lalu Prasad's son Tej Pratap, police said.

Their car was on its way to Kishanganj from Patna when the driver lost control and the vehicle broke through the road divider and collided head-on with a truck coming from the opposite direction in Simraha police station area around 6 am, a police officer said.

The deceased have been identified as Ikramul Haq Baghi, party activist and son of former state minister Islamuddin; Kishanganj district president Intekhab Alam; Dighalganj block president Pappu; and driver Sahil, said Manoj Kumar, sub-divisional police officer (SDPO), Forbesganj, Araria district.

"It appears that the driver had dozed off behind the steering wheel, resulting in loss of control over the car," the SDPO said.

All four occupants of the vehicle died and their bodies have been sent for post-mortem examination, he added.