At least three San Francisco businesses were robbed at gunpoint Monday, all victims of a thief or thieves demonstrating the same MO.

Police say that the first stick-up went down at 2:06 p.m. Monday, at a business on the 300 block of Clay Street, which is between Battery and Davis Streets.

According to the San Francisco Police Department, a man in his 30s entered the business, pointed a handgun at the 29 and 26-year-old women inside the establishment, and took money from the register. He then fled in an unknown direction.

An hour later, the same thing, this time on the 1800 block of Lombard Street, which is between Buchanan and Laguna Streets.

At 3:09 p.m., police say a man in his 30s "entered the business displayed a handgun and took money from the register." The 39-year-old man working at the business at the time of the robbery was not injured, police say.

The suspect fled by car, police say. Was it he who then at 3:55 p.m. robbed a third business, this one on the 3400 block of Geary Boulevard between Jordan and Commonwealth Avenues?

In this case, police say that the suspect (again, a male in this 30s) entered the business and ordered a drink. When the 32-year-old female cashier opened the register, the man "brandished [a] hand gun and demanded money."

The employee handed over the cash, and the suspect again fled in a vehicle, police say.

As of publication time, the SFPD has not released any additional details on the suspect or suspects, nor have they indicated that the robberies were related. As of publication time, police confirm that no arrests have been made, and the suspect or suspects remain at large.