Private security guards were on duty alongside checkposts that have come up at the schools located in Clifton, Defense and other posh areas, Geo News reported on Tuesday.

Police and private security guards will  also be deployed on rooftops of schools from 6 a.m. till the time school gets over.

There have been security concerns ever since the Taliban dramatically stepped up terror strikes in the country to retaliate over US drone attacks. The Pakistani Army is battling the Taliban in South Waziristan.

A twin suicide bombing on  October 20 at the International Islamic University here had killed seven people. Schools and colleges in various provinces, including Punjab, had been closed over fears that terrorists may strike there.

After the suicide bombing on Monday at the garrison city of Rawalpindi, schools were promptly shut down and children were escorted back home by security personnel.

The latest wave of Islamist militant violence in Pakistan started with a suicide bombing at the offices of the UN World Food Programme in Islamabad on October 5.
 
Over 200 people have been killed in the spate of terror attacks, including massive bombings. The attacks have taken place in various parts of the country, including capital Islamabad.

Oct 28 saw the worst terror attack in Pakistan this year when over 100 people were killed in a massive bombing in a crowded market of Peshawar.