Four people, including a police force member, were killed in two separate attacks by unidentified gunmen in the city of Jalalabad city, the center of Nangarhar province, on Tuesday morning, security sources said. 

The first incident happened at around 07:40 am local time in Jalalabad’s PD3 after gunmen opened fire on a police vehicle in which one policeman was killed and two others were wounded, according to sources. 

The gunmen escaped from the area, the sources said. 

The second incident happened 20 minutes later after unidentified gunmen attacked a vehicle in Jalalabad's PD4 in which three people were killed, the sources said. 

A source in Jalalabad hospital said two policemen and a doctor are the victims of the second attack. 

Local officials have not commented on the attacks. 

No group has claimed responsibility for the attacks.