Pakistani security forces Tuesday foiled a bid to target an airport, girls school and a children park in a north-west town of frontier province (NWFP), but no arrests were made, said officials.Forces acting on an intelligence report, put the airport in Kohat town, about 250 kilometers from here, on alert, security officials told KUNA. They said after thorough surveillance, forces recovered three rockets, planted near the main wall of airport. Forces also recovered a five Russian made hand-grenades, 3 fuse and batteries, they added. In similar raids, officials said further, a time bomb was recovered from the office of government girls school and a children park. Officials said security in the town had been put on red alert and police was trying to trace the suspects involved.