The Ministry of Home Affairs has issued a warning that the Islamic State (Isis) is planning an "aerial attack" on 15 sensitive locations in New Delhi, including Prime Minister Narendra Modi's official residence on 7, Race Course Road.

According to ANI, the ministry has received intel that besides Isis, several terror groups, including al Qaeda, want to carry out attacks in Delhi.

The security agencies have prepared a list of 15 high-security zones which Isis terrorists plan to hit, said the report.

Based on the intel inputs on an Isis aerial attacks, security has been beefed up in places such as Modi's official residence, the homes of the home minister and vice-president, Rashtrapati Bhavan, Rajpath, India Gate and the CGO Complex, which houses the headquarters of the CBI, CISF and BSF.

The ministry said Isis may use unmanned aircraft system, drones, and paramotors for carrying out the attacks.

Security agencies have been instructed to shoot down any unidentified or suspicious flying object once it is declared "non-friendly" by the India Air Force.

Last month, a CISF inspector was suspended after the airport traffic control spotted an unidentified drone at the runway of the Indira Gandhi International Airport in New Delhi. 

Despite Delhi being on high security alert, the mysterious drone has still not been found. 

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