Security has been red alerted in Islamabad and Rawalpindi in view of information of 7 suicide bombers entering the twin cities, said the Interior Ministry sources. The police authorities have been informed in writing about the intelligence agencies information that 7 suicide attackers had entered the twin city, sources said. They have been directed to step up security at all the important places and people. The police have started to chalk out a fresh security plan while monitoring is being carried out at sensitive places besides strict watch is being maintained for suspected individuals.