The vehicle used in the Seaview suicide blast is registered to Maqbool Khokhar, a resident of the Khokhar Mohalla in Hyderabad.
The registration number of the vehicle is CN-5294.
Police and intelligence officials arrested five people including Maqbool Khokhar and his son, in a late-night raid in Hyderabad.
Police have shifted the suspects to an unknown location for investigation.
According to the police, no report of a stolen vehicle has been registered in any police station.
Four suicide bombers blew themselves up in their car when intercepted by police on Wednesday night in Karachi, also killing two policemen.
Police signalled a car to stop at a checkpoint, but the driver sped away and police chased them, he said, adding that when police cornered the vehicle, its occupants blew it up.
"We have found a suicide vest with explosives, hand grenades and other things from the wreckage of the vehicle," senior police official Shaukat Hussain told AFP.
"We have also found some human limbs and investigating if these were of another suicide bomber," he added.
Karachi has a history of suicide bombings and attacks on religious parades and Sufi shrines.
COMMENTS (9)
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Its very easy to critique the police...after the minimum wages they get and risk they take every day on their lives for us....The very least we can do is show respect and gratitude to them and oblige them if we were to ever run through any check posts...
Express Tribune would do well to at the very least publish the names of the two policemen who lost their lives doing nothing but their duty.
Many of us consider these check posts as mere inconvenience (some even put the occupants of these check posts in the same basket) but look how they helped save so many lives.
What rubbish .this is an internal drama caused for whatever reasons which took down 2 cops.
Well done Police!
Arrest Hamid Gul!
Thankyou police uncle you saved alot of innocent souls