"The hostile forces chose the right time to hit the country when Pakistan was going to host a mega sports event in Lahore in March. They wanted to show the world that Pakistan is neither safe for sports nor suitable for investment," he said.

He believed that the chronic disease of terrorism has not been completely cured. "No doubt there was a great operation against terrorism, but majority of them either ran to Afghanistan or went underground in the country. The current wave is proof that they have re-established their networks."

The Pakistani Army announced immediately after the Sehwan blast to close Pakistan-Afghanistan border for security reasons and it also summoned an Afghan embassy official to the army headquarters and handed over a list of 76 most wanted terrorists hiding in Afghanistan.

Thursday's blast was claimed by the militant group of Islamic State (IS). The notorious extremist group also carried out two major attacks in Pakistan last year. In November, IS staged a suicide bomb at a shrine in Balochistan Province, leaving 52 killed and 102 injured. The group also claimed that it attacked a police training center in Quetta in October, with 60 killed and 117 injured.

The IS attacks also prompted concerns that whether the extremist group has already infiltrated into Pakistan. "In the past there has been debates whether IS is present in Pakistan or not. The Pakistani government never accepted such claims," said the expert.

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