Wednesday was not a great day for pedestrians in San Francisco. Not only was an elderly woman hit and killed by a driver while in a Chinatown crosswalk, but another elderly woman was struck by a hit-and-run cyclist that police continue to seek.

According to San Francisco Police Department spokesperson Officer Albie Esparza, an 81-year-old woman was crossing Alert Alley on Landers Street Wednesday at 11:24 a.m. when a cyclist slammed into her from behind, knocking her to the ground and injuring her face.

The cyclist, who was turning onto Landers from Alert when he struck the pedestrian, fled the scene and is being sought by police, Esparza says. The victim was transported to Davies Medical Center for treatment of her injuries, which were not considered life-threatening.

Alert and Landers is the intersection of two small streets between 15th and 16th Streets in the Mission, which is faced by several back doors and driveways, Esparza says.

As police believe that it's likely that many residences have security cameras that face out into the area, he asks that homeowners review those cameras for footage and contact the police if they caught the collision on tape.

Police are also canvassing the area to find any witnesses to the incident or to get a description of the suspect, Esparza says.

In Wednesday's second pedestrian incident, 77-year-old San Francisco woman Ai You Zhou was struck and killed by 59-year-old driver Tim Pak Wong as she walked in a crosswalk at Clay and Kearny streets at 6 that evening.

Streetsblog reports that Zhou was in the crosswalk as Wong turned left onto Kearny from Clay.

She was rushed to San Francisco General Hospital after Wong struck her, but died there of her injuries.

Esparza says that Wong cooperated with police following the crash, and was released after being cited on suspicion of failing to yield to a pedestrian in a crosswalk and misdemeanor manslaughter.

Esparza says that it's up to San Francisco's District Attorney's office to determine the specific charges Wong will face in court for Zhou's death. A spokesperson for the DA"s office has not responded to SFist's request for comment at publication time.