New Delhi: The war against the Islamic State of Iraq and the Levant (ISIL) will be “long, difficult and global," French ambassador Francois Richier said on Monday in New Delhi, indicating the challenges involved in defeating the group responsible for the killings of at least 127 people in the recent terror attacks in Paris.

There is an international coalition of more than 100 countries working to defeat the ISIL, Richier said, adding that the war is expected to be focused mainly in Iraq and Syria.

The French air force had carried out retaliatory strikes against ISIL positions in Raqqa, considered the headquarters of the hardline Sunni group in Syria, and had destroyed one training facility and many command centres, Richier said.

The French ambassador’s comments came as India joined other countries in observing a minute’s silence at 4.30 pm local time to honour those killed in Friday’s attacks in Paris.

The worst terror attack in French history has stunned the capital, less than 11 months after jihadists struck satirical magazine Charlie Hebdo and a Jewish supermarket, killing 17.

Richier said public places like museums and galleries will reopen Monday as the French government and the people resume their daily lives.

But border controls along France’s frontiers with its neighbours will be in place to prevent the entry or exit of individuals related to Friday’s attacks. It is estimated that 1,500 French citizens travelled to Iraq and Syria to join the ISIL ranks, of which 100 have returned home, he said.

On the upcoming UN Climate Change Conference in Paris to be held on 30 November, some events planned along the sidelines of the main summit will be curtailed, Richier said.

Improved safety measures will be put in place to ensure the security of the estimated 80 heads of state expected to visit Paris for the summit, he said.

US President Barack Obama will be among the heads of state and government expected at the conference, scheduled to take place at Le Bourget, outside Paris, from 30 November to 11 December. The talks aim to forge a new international pact from 2020 to curb heat-trapping greenhouse gases that stoke climate change.