Patna, Dec 24 (IANS) Three people were arrested Wednesday for killing a police officer in Bihar's Saran district, police said.

Sanjay Kumar Tiwari, the 40-year-old officer in-charge of Ishuapur police station, was killed by three motorcycle-riding assailants Monday.

Police Wednesday arrested the three after tracking their mobile phone locations, a district police official said.

The motorcycle used by them and mobile phones were also recovered.

Tiwari's killing shocked his colleagues as well as his neighbours because he was regarded as an honest and hard-working police officer.