The attack happened on the afternoon of Nov. 3 on the 1000 block of Race Street, according to the Philadelphia Police Department. The woman was walking when a man riding a bicycle extended his arm and hit her in the face, police said. The force of the blow knocked her backward onto the sidewalk.

She was taken to Temple Hospital for treatment of facial pain and swelling.

Investigators obtained surveillance video showing the suspect picking up a food delivery order at that location shortly before the assault, police said. He was riding a blue and silver bicycle. Police also have footage of the assault itself, which shows the man leaving the area southbound on 10th Street. Authorities have not released that video but have shared other surveillance images of the suspect.

In the images, the man is wearing a pink knit hat and red Nike sneakers and is carrying an orange Grubhub bag.

Police are urging anyone who spots the suspect to call 911 immediately and not to approach him. Tips can also be submitted by calling 215-686-TIPS (8477) or through an anonymous online form.

The assault is the latest in a series of incidents that have raised concerns about safety in the busy commercial corridor, where residents, workers and delivery riders share crowded sidewalks. Chinatown community groups have long pressed for more resources for older residents and pedestrians, and the case is likely to renew those calls.

Anyone with information is asked to come forward. Police have not released further details about the investigation.