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France attacks ISIS: Jets pound jihadi sites in Raqqa, Syria in response to Paris attacks

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SYRIA— French fighter jets launched a series of attacks on ISIS sites in Raqqa, Syria on Sunday in what officials described as a major bombardment.

The strike involved 12 aircraft including 10 fighter jets. Twenty bombs were dropped, hitting all targets said Mickael Soria, press adviser for France's defense minister.

A French defense official said the "massive" airstrike destroyed a jihadi training camp and a munitions dump in the region.

The jets were launched from sites in Jordan and the Persian Gulf.

ISIS claims Raqqa as the capital of its so-called caliphate. The terrorist group claimed responsibility for a series of terrorist attacks in Paris on Friday that killed 132 people.

France's President Francois Hollande described those attacks as "an act of war."

What impact did airstrikes have?

It's hard to know what's happening on the ground inside Raqqa. Since ISIS took over, the city has become increasingly isolated -- with an activist group known as Raqqa is Being Slaughtered Silently providing outsiders with a harrowing glimpse of the city's transformation.

On Sunday, the activist collective said that the city appeared to be bracing for an attack even before the French airstrikes began.

ISIS fighters in Raqqa had expected retaliatory airstrikes and evacuated key facilities, including their headquarters, operation and security buildings, a member of Raqqa is Being Slaughtered Silently said.

Streets were empty, the activists said, markets were less crowded than usual and sheikhs in mosques said they expected the city to be struck.

The airstrikes hit several key ISIS facilities, including the city's stadium, activists said, used by ISIS as both its headquarters and a jail. It was not immediately clear what the damage was. So far, according to Raqqa is Being Slaughtered Silently, there have been no reports of civilian casualties.

The ISIS media wing Amaaq also said the sites hit by airstrikes had been abandoned and that no one had been killed in the airstrikes. CNN has not independently confirmed the groups' reports.

ISIS in Raqqa was previously the target of retaliatory airstrikes in February. Two days after news emerged that the group had burned a captive Jordanian pilot to death, the Middle Eastern nation hit back. At the time, ISIS posted photos of the destruction from the Jordanian airstrikes and the activist Syrian Observatory for Human Rights said 10 militants were killed.

This is a developing story, check back for updates.