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XXXTentacion's murder investigation just intensified as cops have officially named a second person of interest.

The Broward County Sheriff's office is searching for 22-year-old Robert Allen who may be connected to the killing of the 20-year-old rapper over a week ago. Cops say Allen was on surveillance video at the motorcycle shop in Pompano Beach where XXX was shopping before he was gunned down in his car.

It's unclear why cops believe Allen might be connected to the murder. As we previously reported ... cops have already arrested Dedrick Williams for murder and said there were at least 2 other suspects.