According to DIG Larkana, seven of the Shikarpur attack suspects have been arrested while others will also be traced shortly.
He said intelligence agencies and Police are jointly working with each other.
He maintained that police will soon catch the chief culprit of the attack.
A bomb tore through a busy Shiite mosque in Shikharpur, district of Sindh, on January 30 killing at least 55 people, in the deadliest attack to hit the country in nearly two years.
The blast hit the mosque in Shikarpur in Sindh province, around 470 kilometres (300 miles) north of Karachi, as hundreds of worshippers attended Friday prayers.