[Geo News] Following the twin blasts in North West Frontier Province (NWFP)'s provincial capital Peshawar, the security have been put on high alert in federal capital Islamabad while red zone has been completely sealed up late on Thursday, according to the report of Geo news. As per police sources, no trespassing is allowed in red zone area here coupled with the strict monitoring of the vehicles entering the city. The vehicles of the diplomatic personnel are also being checked up through trained dogs in Diplomatic Enclave, sources said adding that the security at the hotels, guesthouses and sensitive buildings across capital has been stringent.