Two pedestrians suffered life-threatening injuries yesterday in separate collisions, according to police.

In the first incident, which took place around 6:20am near San Jose and Geneva avenues in Balboa Park, a 45-year-old man struck a 22-year-old woman with his vehicle as she was crossing the street.

The victim was transported to a hospital with critical injuries, and the driver remained at the scene. The crash occurred on the city's high injury network, the 12 percent of surface streets where more than 70 percent of the most severe and fatal injuries occur.

The second collision happened at 6:03pm near Irving Street and Sunset Boulevard when an unknown motorcyclist struck a pedestrian in the roadway. The victim, a 62-year-old woman, was taken to a hospital with serious injuries.

Anyone who has information about either of these incidents is encouraged to contact SFPD via the department's anonymous tip line at 415-575-4444, or text TIP411 with "SFPD" at the start of the message.

Here’s why we usually don’t include suspect descriptions in crime reports.