"Deeply concerned at the loss of three lives in police firing in Morang district in Nepal's Terai yesterday", External Affairs Ministry Spokesman Vikas Swarup said on the ministry's Twitter account late last evening.

"Political problems need political solution", he added.

At least three people were killed and five others injured in Morang district when anti-government protesters clashed with police. Nepal's southern plains, the Terai, has witnessed killing of at least 56 people and policemen in five months in anti-constitution protests launched by the Samuktya Loktantrik Madheshi Morcha.

Tension flared up in the southern town of Biratnagar bordering India after cadres of the Morcha attempted to disturb a programme organised by ruling CPN-UML's (Communist Party of Nepal-Unified Marxist-Leninist) youth wing with the Youth Association of Nepal (YAN).