Police say the attackers smashed three car windows and grabbed a Blackberry and two computers and demanded money. They stole $3,000 in cash and more than $4,000 worth of items.
The report says Ament tried to get away, but one of the assailants chased him down and knocked him to the ground. Ament suffered a head wound and his passport was stolen.
Surveillance cameras caught the incident but no arrests have been made.
Pearl Jam management had no comment Thursday.
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