San Diego Police are investigating the report of a homeless man struck on the back of the head in the East Village area of downtown.
The man was injured at 10th Avenue and G Streets just before 6:30 a.m.
Police have been on high alert for crimes against the city's homeless since a deadly series of attacks began on July 3.
SDPD tells NBC 7 the East Village victim was bleeding from the head and was at the hospital with what's described as non-life threatening injuries.
The victim, described by police as a transient, told police the suspect was riding a blue bike and hit him over the head with an unknown object.
Investigators say they are not sure if the suspect got off the bike or attacked the victim while riding.
The suspect was last seen leaving the area on a blue mountain bike traveling eastbound on G Street and south on 9th Avenue. No other information was immediately available.
Hours later, San Diego Police posted an update on Twitter saying they do not think Wednesday's attack is connected to last week's violent crime spree.
Four men were beaten in four days with two of the men set on fire, according to homicide investigators. Only one of the men survived. He's hospitalized in critical condition.