Air strikes

For once the U.S. doesn't top this list—and China doesn't even make the top 50.

The Islamic State militant group still retains control of the west of the city, where 200,000 people are trapped.

"We are not increasing our role in the Syrian civil war. But we will defend our troops," said U.S. Defense Secretary Jim Mattis

A watchdog is questioning the White House's legal basis for the attack despite bipartisan support.

The British foreign secretary said the 2013 vote against intervention had limited the U.K.'s ability to influence events in Syria.

At least 6,000 people have died in the past 80 days, as rebels battle regime forces.

The dead included 11 children, and dozens more people were wounded.

Paris is providing weapons, air support and advice to French troops in the campaign to capture Manbij.

Decision follows March 22 attacks on Brussels that were claimed by the extremist group.

Neil Prakash was Australia's highest value target fighting for the radical Islamist group.

42 people were killed and 37 were wounded during the strike on October 3 that destroyed the hospital run by Doctors Without Borders.

The U.S. regards AQAP training camp as one of the deadliest branches of the network founded by Osama bin Laden.

The country joins France and the U.K. among European nations bombing targets in Syria.

A U.S.-led coalition has killed 10 Islamic State leaders in the past month.

The mounting civilian death toll and dire humanitarian situation has alarmed human rights groups.

The United States will shine a global spotlight on the conflict on December 22 at the United Nations.

Among other reasons: civilian casualties.

The three brothers were waiting for their brides' party to arrive when a missile hit their house.

The greatest tragedy caused by U.S. forces in several years has elicited strong criticism.

Turkey said that a Russian jet had violated its airspace for the second time.

Turkey has "strongly protested" the violation, according to a statement.

Russia began airstrikes in Syria on Wednesday. Who else is bombing the country?

The strikes seemed to have been carried out near Homs, an area crucial to Assad's control of western Syria.

Targets in the Homs area appeared to have been struck, but not areas held by Islamic State, the U.S. official said.

Medics and locals officials have confirmed two houses were struck by bombs, killing mostly civilians.

A week-long pause in the fighting was meant to have started on Saturday.

While Washington wrings its hands, the Islamic State is making gains and it's Iran that's fighting back.

This is the first time the Pentagon has acknowledged civilian casualties since it began an air campaign against Islamic State militants in Syria and Iraq.

Al Qaeda in the Arabian Peninsula said on Thursday a U.S. air strike had killed the senior figure who issued the group's claim of responsibility for the Charlie Hebdo attack in Paris.

After a month-long campaign of airstrikes against Houthi rebels in Yemen, Saudia Arabia said it would back a political solution to bring peace to its war-ravaged neighbor.