Police have arrested the prime suspect in the double murder case involving a Sikh caretaker couple who were shot dead at a gurdwara in Pakistan’s Khyber Pakhtunkhwa province, officials said.Jagannath and wife Asma Wanti served as caretakers of the gurdwara at Babu Mohalla in Mardan district, about 60 km northwest of Peshawar. They were shot dead on Wednesday.Addressing a press conference on Thursday, Mardan District Police Officer (DPO) Masood Ahmad Bangash said the prime suspect in the case had been arrested.The suspect has been identified as Sher Shah, a resident of Amazugari.Bangash said investigations conducted by a Joint Investigation Team (JIT), comprising police officials, Counter-Terrorism Department (CTD) personnel and other senior authorities, have so far found no evidence linking the suspect to any banned outfit, terrorist organisation or organised network.The motive behind the killings remains unclear, and authorities are examining all possible angles in light of the suspect’s statements and other evidence collected so far, the DPO said.