San Francisco police are investigating a rash of street robberies around the city in which the victims were attacked with pepper spray, authorities said Friday.

The first holdup was reported on the 200 block of Florida Street in the Mission District shortly before 9 p.m. Wednesday. Two men grabbed a 41-year-old woman's cell phone, sprayed the chemical irritant in her face and kicked her before running away, police said.

About an hour and a half later, two men pepper-sprayed a 26-year-old man on the 700 block of Page Street in the Lower Haight and stole his wallet, iPod and backpack before fleeing in a Saturn, police said.

At about 11:35 p.m., a man pepper-sprayed a 29-year-old woman near Pine and Larkin streets on Nob Hill, reached into her purse and stole her wallet, cash, credit cards and cell phone.

Two similar robberies were reported Thursday night.

At about 9:40 p.m., four men accosted a 28-year-old woman at Bush and Scott streets in Lower Pacific Heights. One of the men pepper-sprayed her in the eyes while another man stole her cell phone, purse and cash.

Ten minutes later, a 45-year-old woman walking near Filbert and Pierce streets in Cow Hollow turned around when she felt someone pulling at her purse. A man pepper-sprayed her in the face, hit in the head and stole her purse before running away with a second man, police said.

No arrests have been made in any of the holdups, and police had only general descriptions of the perpetrators. None of the victims was seriously hurt.

In another incident, two men entered a jewelry store on the 800 block of Market Street at about 10:45 a.m. Tuesday, pepper-sprayed a male employee and stole numerous wrist watches. The 28-year-old victim suffered minor injuries.

It was not known if the robbery was related to the street holdups, police said.