The government alerted the Delhi [ Images ] police on the US advisory on possibility of terror attacks in the national capital and asked it to take necessary steps to strengthen security.

"We are aware of the advisory. We have alerted the Delhi police. All necessary steps are being taken," a ministry of home affairs spokesperson said on Thursday.

The US issued a fresh warning to its citizens in India [ Images ] on Wednesday asking them to restrict themselves from visiting congested areas of Delhi following "increased indications" of terrorists planning attacks.

"There are increased indications that terrorists are planning attacks in New Delhi. Terrorists have targeted places in the past where US citizens or Westerners are known to congregate or visit, a security message issued by the US Embassy said on Wednesday.

"Markets, such as those located in Chandni Chowk, Connaught Place, Greater Kailash, Karol Bagh, Mehrauli, and Sarojini Nagar, can be especially attractive targets for terrorist groups," it said.

Close to the heels of the US, Australia [ Images ] also warned its citizens to exercise a high degree of caution and avoid some of the shopping areas and markets in India's national capital because of the high risk of terrorist activity.

"On 21 April, the United States and Canada [ Images ] issued separate warnings about possible attacks against markets frequented by foreigners in New Delhi. According to these warnings... We strongly advise Australians to minimise their presence in market areas of New Delhi," it said.

The US advisory has asked its citizens to exit any area where unattended packages were spotted and to report the matter to authorities.