SAN FRANCISCO—A two-month investigation has culminated in the arrest of two suspects that law enforcement believe to be the criminals responsible for a series of robberies dating back to April.

The robberies had been given the name the “Letterman Robber Series” because of a letterman-style jacket that was worn by one of the suspects during their heists.

The first robbery in the Letterman Series took place on April 22 at a Bayview District gas station located on the 2900 block of San Bruno Avenue. Following that first robbery, three more robberies occurred in San Francisco in a span of several days.

Homer Matthews, 56, the first suspect, was arrested on May 24 after officers recognized him from a crime alert bulletin.

The second suspect, 31-year-old Austin Chin, remained at large until law enforcement received a warrant to search his home, located on the 100 block of Nursery Way in South San Francisco.

With the help of the San Mateo North County Regional SWAT Team, San Francisco police arrested Chin and confiscated a total of 38 different firearms from his residence. Police also found bomb making materials and a number of other weapons.

The confiscated firearms included 22 assault weapons, 12 handguns, two shotguns, and two bolt-actions sniper rifles.