Yemen’s Houthi rebels say they have executed nine people for their alleged involvement in the killing of a senior official in an air strike by the Saudi-led coalition more than three years ago.

Syrians are marking 10 years since peaceful protests against President Bashar Assad’s government erupted in March 2011, touching off a popular uprising that quickly turned into a full-blown civil war.

As Syria marked the 10th anniversary on Monday of the start of its uprising-turned-civil war, President Bashar Assad remains in power, propped up by Russia and Iran.

The Saudi-led coalition fighting Iran-backed rebels in Yemen said it has launched a new air campaign on the country’s capital and other provinces, in retaliation for missile and drone attacks on Saudi Arabia.