Valsad: Security has been beefed up in the south Gujarat district after inputs from Intelligence Bureau (IB) that around 13 alleged terrorists are suspected to have entered the district via sea-route, a senior police official said in Valsad today.br br "We have received an input stating that some 13 alleged terrorists are suspected to have entered the district through the coast. We have stepped up surveillance," said Valsad superintendent of police Nipuna Torwane.