The main accused behind firing at the dental clinic in Karachi was Friday arrested, reported 24NewsHD TV channel.
According to the Counter-Terrorism Department (CTD), the accused belonged to the banned Sindh Revolutionary Army (SRA).
Raids were being conducted for the arrest of his accomplices.
The accused had entered the dental clinic and shot a Canadian citizen of Pakistani origin dead and injured two doctors.
Meanwhile, Sindh Information Minister Sharjeel Inam Memon told the media that a sad incident had happened at the dental clinic in Saddr, Karachi.
“One doctor was killed and two others were injured due to firing by the terrorists,” he added.
“The terrorists have been arrested through a joint action by the institutions,” he stated.
“The law-enforcement agencies are doing a good work. The movement of the terrorists had been examined through CCTV footage,” he told the media.
He added that the Sindh chief minister had tasked the Sindh inspector general of police (IGP) with arresting the killers.
He said that the CTD monitored the movement of the terrorists on cameras with the help of modern technology and arrested them.
“Arms and motorcycle that had been used in the incident were recovered from terrorist Waqar Khushk,” he stated.
“Those who look at Pakistan with an evil eye will have to bite the dust. Sindh police are not sitting idle,” he warned.
“Terrorists want to create panic in Pakistan. The CTD and other agencies had investigated the incident. Further investigations from terrorist Waqar Khushk were underway,” he added.
The Sindh information minister also castigated Pakistan Tehreek-e-Insaf (PTI) Chairman Imran Khan and blamed him for conspiring against the institutions.
“Imran Khan is spreading mischief through social media,” he alleged.