Delhi Police arrested a Hizb-ul-Mujahideen operative, who was earlier associated with the Peoples Democratic Party, on Tuesday for allegedly killing a sub-inspector of Jammu and Kashmir Police, officials said.

The man, identified as Ansar Ul Haqe, a resident of Pulwama district of Jammu and Kashmir, allegedly hatched a conspiracy to kill the sub-inspector with his girlfriend after finding out that she knew the policeman, they added.