The Kerala coast has been put on high alert following intelligence reports that boats carrying 15 ISIS terrorists had set off from Sri Lanka to the Lakshadweep islands, police said Saturday, the NDTV reported.

According to highly places sources in the police department, the coastal police stations and coastal district police chiefs have been alerted.

"Such alerts are usual practice but this time we have a specific information about the number. We have alerted the coastal police stations and the police chiefs of coastal districts to be on alert in case of any sighting of suspicious vessels," a top police source told PTI.

The coastal police department said it was on alert since May 23, the day alert came from Sri Lanka.

"We were on alert since the Sri Lankan attack took place. We have also alerted the fishing vessels and others venturing into the sea to be cautious of suspicious activities," coastal department sources confirmed to PTI.

After the serial bomb blasts in Sri Lanka, Kerala was on alert, especially after NIA investigations revealed that ISIS operatives had planned attacks in the State.

Intelligence agencies believe that a considerable number of people from Kerala are still with the ISIS which was recently wiped out from Iraq and Syria.