According to intelligence sources, four terrorists belonging to the Jaish-E-Mohammad, including 3 Pakistani nationals and 1 Afghan national, entered Delhi last month and are likely to be hiding in the city. These terrorists are being accompanied by two over-ground workers - a 24 year old girl from Sopore and a boy from Anantnag in Kashmir valley. The terrorists are believed to be on a suicide mission. Security agencies in the national capital are on a high alert in the city. 2 weeks ago terrorist Zakir Musa was spotted in Punjab.