A cyclist was killed by an MTA bus in Harlem early this morning, in the city's fourth traffic fatality in nearly 24 hours.

According to police, 45-year-old Pedro Santiago was biking east on West 125th Street near Lenox Avenue at around 1:30 a.m. when a Bx15 bus traveling the same direction on 125th left the stop to merge into the travel lane. The bus struck Santiago with the driver's side, and the cyclist became lodged underneath the bus. Santiago was pronounced dead at the scene.

The bus driver remained at the scene of the collision. No charges have been filed, and the investigation is ongoing.

Two pedestrians were killed in Queens, and another was killed on West 96th Street between Saturday morning and Sunday morning.

On Wednesday, Mayor de Blasio told reporters that he was taking immediate steps to address the "epidemic" of pedestrian fatalities across the city, and NYPD Commissioner Bill Bratton said that the staffs of the department's Highway Division and Collision Investigation Squad were being increased.