Jammu, May 24 -- The State Investigation Agency (SIA) on Friday launched a crackdown on "terror sleeper cells and their associates", conducting coordinated raids at 18 locations across the Jammu region and recovering substantial incriminating material, an official said.

The operation targeted the terror ecosystem in the districts of Poonch, Rajouri, Udhampur and Ramban, said a spokesperson of the SIA.

Of the 18 locations raided, 12 were in the Surankote subdivision and three in the Haveli tehsil of Poonch district, he added.

The spokesperson said that additional operations were carried out at one location each in Rajouri town (Rajouri district), Ramnagar (Udhampur district) and Ramban.

"A considerable quantity of incriminating material ...