The governments of Australia, the U.S. and the U.K. on Sunday warned of an "imminent' terror attacks in New Delhi targeting public areas, including markets in Connaught Place, Greater Kailash and Chandri Chwok.

The Australian advisory said, "Reliable reporting indicates that terrorists may be planning to attack markets in New Delhi, including those frequented by foreigners. Such attacks could occur any time from April 22."

"Specific and credible information indicates terrorist attacks in New Delhi, especially in markets, may be imminent," it added.

The U.S. Embassy website warned, "There are increased indications that terrorists are planning imminent attacks in New Delhi. Terrorists have targeted places in the past that US citizens or westerners are known to visit."

"Markets, such as those located in Chandni Chowk, Connaught Place, Greater Kailash, Karol Bagh, Mehrauli and Sarojini Nagar can be attractive targets for terrorist groups. If you are in an area where unattended packages are spotted, you should immediately exit the area and report the packages to authorities," the report added.

The warning came after the U.S. issued a similar threat last year. However, this updated issue has the word "imminent" added into it.

The warnings are also a big blow to the Indian government which has been trying to assure various governments that it can safely host the upcoming Commonwealth Games this year.

Security issue has been a major concern in India's sporting events. The UK badminton team, which was supposed to compete for the world badminton championship in 2009, had to return home shortly after touching down in India, but without setting foot in Hyderabad, the site of the event.

An estimated 8,000 athletes from across the world are expected to participate in the Commonwealth Games.

The Indian government has vowed to provide "foolproof" security during the games and secure athletes as well as spectators during the game.

But the London-based Commonwealth Games Federation said India's security arrangement for the Games is still under "continual review."