KARACHI:  Police and Rangers on Friday claimed to have arrested a suspect allegedly behind the killing of senior journalist Aftab Alam. 
 
According to the security officials, the suspect has been apprehended in the murder case of Alam and he was being interrogated to trace the other suspects.
 
Alam was gunned down on Wednesday by unknown gunmen outside his house in North Karachi while he was going to pick his children from school.