"The attack in Karachi is deeply saddening and utterly condemnable. Our thoughts are with the families of the deceased," he said.

"We stand firmly with the people of Pakistan in this hour of grief. I wish all those injured a quick recovery," the Prime Minister said.

See in Pics: Gunmen kill dozens in Pakistan bus attack!!!

Also, Pakistan President Mamnoon Hussain and Prime Minister Nawaz Sharif have strongly condemned the terrorism incident. Sharif also sought a report from the authorities on the incident.

The attack came a day after Sharif's Kabul visit where he said that enemies of Afghanistan are also enemies of Pakistan.

Read More: 47 Shia Ismaili Muslims killed after gunmen open fire on bus in Pakistan

At least 47 people from the minority Shia Ismaili community were killed and several others injured after eight gunmen entered their bus and opened indiscriminate fire in Karachi.

The death toll could rise as about 20 others are seriously injured. The injured and dead were shifted to various hospitals by rescue workers.

The gunmen stopped the packed bus, entered it and opened fire indiscriminately. A senior police official said the attackers entered the bus and shot the passengers in the head.

Nobody took the responsibility but the Taliban and groups like Lashkar-e-Jhangvi often carry out such attack. However, a pamphlet of terrorist group Islamic State was recovered from the scene, according to a police official but government has not so far named any group for the attack.

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