U.S. President Barack Obama delivers a live televised address to the nation on his plans for military action against the Islamic State, from the Cross Hall of the White House in Washington September 10, 2014. REUTERS/Saul Loeb/Pool (UNITED STATES - Tags:
U.S. President Barack Obama delivers a live televised address to the nation on his plans for military action against the Islamic State, from the Cross Hall of the White House in Washington September 10, 2014. REUTERS/Saul Loeb/Pool (UNITED STATES - Tags: POLITICS MILITARY CONFLICT) Reuters/Saul Loeb/Pool

The United States and its ally nations has launched their first airstrike against the ISIS in Syria, Pentagon said on Monday.

Spokesman Rear Adm John Kirby said the coalition's attack versus the radical terror group used fighter and bomber jets as well as Tomahawk missiles. It was also revealed that a number of Arab nations were among those that participated in the airstrikes, including Jordan, Saudi Arabia, Bahrain, Qatar and the United Arab Emirates.

"Given that these operations are ongoing, we are not in a position to provide additional details at this time," Rear Adm Kirby said in a statement. But he confirmed that the strikes were carried out by the "U.S. military and partner nation forces."

Rear Adm Kirby added it was Gen Lloyd Austin, head of U.S. Central Command, who made the decision to strike in Syria, "under authorisation granted him by the commander in chief."

The airstrikes are meant to target 20 ISIS positions in Syria. Many of the sites are in Raqqa.

The development comes after Samantha Power, U.S. Ambassador to the United Nations, told various interviews on Sunday that other nations had expressed more than interest to join airstrikes in Syria.

"I will make you a prediction," Power had told ABC in the U.S. "We will not do the air strikes alone if the president decides to do the air strikes."

It has yet to be known if Syria under the Assad government has given explicit permission for the conduct of the airstrikes.

Power did not identify on Sunday the countries willing to join the U.S. in the fight against terrorism and ISIS. "We're going to leave it to other nations to announce for themselves what their specific commitments to the coalition are going to be."

Last week, France launched airstrikes inside Iraq, but not in Syria.

World leaders are converging on Wednesday at the United Nations. U.S. President Barack Obama is expected to again make the case for world action against Islamic State.

U.S. Parliament last week approved the release of $500 million to arm and train Syrian rebels to fight Islamic State.