"A team of NSG (National Security Guard) arrived in Gujarat last night following the terror alert. The state has been put on high alert," P.C. Thakur told AFP.
TV footage showed security men frisking visitors outside hotels, cinema and malls.
In a notification issued by the Gujarat home department and seen by AFP, all top police chiefs were asked to return to duty immediately and report any suspicious activity. Thakur said central authorities feared that members of banned militant outfits such as Lashkar-e-Taiba may have infiltrated through Kutch district, which has a land and sea border with Pakistan.