Haitians are pausing to remember the tens of thousands of people who died in the catastrophic earthquake that struck four years ago.

The government of President Michel Martelly issued a decree declaring Sunday a day of remembrance and reflection. The Haitian flag is being flown at half-staff, and clubs are to remain closed.

Haiti's radio and television stations have been encouraged to schedule programs and music for the occasion in honor of the victims.

The 7.0-magnitude earthquake struck outside Haiti's capital on Jan. 12, 2010, and thousands of buildings toppled in Port-au-Prince and surrounding cities.

Officials say more than 300,000 died, but no one knows for certain how many people lost their lives.

The quake left 1.5 million people living in tent camps. That number has fallen to 146,000.