A high alert has been sounded along with the coastal areas of Kerala after an intelligence report said that 15 terrorists of Islamic State had set off from Sri Lanka for the Lakshadweep islands on boats.

The coastal police department has also alerted fishing vessel owners and cautioned others against venturing into the sea. It added that the department has been on alert since May 23 after the intelligence input came from Sri Lanka.

"We have been on alert since the Sri Lankan attack. We have alerted fishing vessel owners and others venturing into the sea to be cautious," a coastal police department official was quoted as saying by news agency PTI.

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As per reports, authorities in coastal areas of Kerala have been put on high alert after coastal police stations and police chiefs were alerted about suspicious vessels, PTI sources said. The sources said that such alerts are "usual practice", however, this time the police have specific information about the number of terrorists.

Following the devastating terror attacks in Sri Lanka, Kerala was put on alert, especially after NIA investigations revealed that IS operatives had planned attacks in the state.

As per intelligence agencies, a considerable number of people from Kerala are in touch with the Islamic State. On April 21, a series of deadly attacks rocked Sri Lanka, killing over 250 people and injuring 500. The Islamic State group claimed responsibility for the attack.