Police Lt. Alan Henley told the San Gabriel Valley Tribune the victim had just made a delivery to a patient on South Sunset Avenue and was headed to his car when the pair confronted him and chased him with batons.
Henley says the attack took place just before 10 p.m. Friday.
Henley says the victim, in his 40s, was scared and dropped a bag containing marijuana and money and the attackers took it.
The lieutenant says he knows of no other ninja-style thefts recently.
The Associated Press contributed to this report.
