The advisory asked to pay close attention to the security situation and take necessary precautions.

The B-1B Lancer bombers from Guam airbase flew over South China Sea on late Thursday as part of operations intended to demonstrate the US commitment to freedom of navigation, the US Air Force said in a statement.

The exercises also involve combat operations command, combat synergies, live fire shooting training, and comprehensive inspection of arms integration, the report said.

But Modi and Xi will attend a BRICS leaders meeting in Hamburg.

China on Wednesday accused India of "trampling" on the Panchsheel principles and asked New Delhi to "correct its mistakes" as soon as possible by pulling back troops.

While China's nationalistic tabloid Global Times said India should be taught a 'bitter lesson', another official newspaper, China Daily, said India should look in the mirror.

Hu Zhiyong, a research fellow at the Shanghai Academy of Social Science, claimed that India is provoking China because it wanted to prove to the United States that it could contain China while Prime Minister Narendra Modi was in the US.

It also dismissed Jaitley's remarks that India of 2017 is different from what it was in 1962, saying China too is different.

China will resolutely safeguard its border sovereignty in conflicts with Indian troops even at the cost of war, GT said.

Observers say China's repeated invitations to India to join the BRI highlights its own anxieties over the adverse impact of New Delhi's lack of support to the multi-billion dollar investments in South Asia as it would deny access to India's market consisting over 1.2 billion people.

Chinese foreign ministry spokesman displayed the photographs of the alleged Indian "incursion" into the area during a media briefing.

Chinese Foreign Ministry spokesman Lu Kang displayed a photograph of Indian 'incursion' into Donglong area.

His remarks came in response to the India-US joint statement issued after the talks between Prime Minister Narendra Modi and US President Donald Trump.

It is equipped with new air defence, anti-missile, anti-ship and anti-submarine weapons.

China said that it had put off the visit of Indian pilgrims who enter Tibet via the Nathu La pass "for safety reasons" in view of the border issue.

Foreign ministry spokesman said no change in China's position in case of non-NPT countries.

The NSG plenary meeting is due to be held next week in the Swiss capital of Bern.

The blast happened around 4:50 pm at the front gate of the kindergarten in Fengxian County in east China's Jiangsu Province when children were leaving the school, officials were quoted as saying by the state-run Xinhua news agency.

China on Monday said India's membership bid in the NSG has become "more complicated" under the "new circumstances" as it again ruled out backing New Delhi's entry in the grouping, saying there should be non-discriminatory solution applicable to all non-NPT signatory countries.

In the fourth such incursion since March, two helicopters of the People's Liberation Army of China hovered for about five minutes in Uttarakhand's Chamoli district and "could have carried out aerial photography of Indian ground troops," according to official sources in the government.