Belongings. Reporter a series of violent holdups near the cal campus have prompted a warning from Berkeley Police. Avoid walking alone after dark and stay alert. Definitely. Reporter she admits to focusing on her phone at times as she walks to and from her house near campus. After learning about these recent robberies, shes going to be ready. Ill keep my backpack out. Its awful that people are hurt. Reporter this organize robbery crew first struck last thursday, november 9 near virginia and spruce streets. This is where two men attacked the victim and tried to steal his backpack. Later that same night there was a similar holdup on the 2600 block of Regent Street on the south side of campus. This past sunday, two robbers tried to fill a mans phone and backpack here on the cons avenue. The victim fought back and the thieves took off. One hour later on scenic avenue, two thieves stole a mans backpack after telling the victim they had a gun. The latest happened on tuesday near virginia and