The Centre has asked the Delhi and Mumbai Police to provide security to Reliance Industries Managing Director and Vice-Chairman Anil Ambani after he reported he had received threatening calls.

Ambani, a Rajya Sabha member, had written to the Centre about two months ago requesting necessary action, sources said.

Indicating that the issue had been looked into by intelligence agencies, the sources said it was not clear who was behind the calls.

Union Minister of State for Home Sriprakash Jaiswal was quoted by a television channel as saying that the Centre was asking the Mumbai police to provide 'Y' class security to Ambani.