SANFORD, Fla.—  Women’s jewelry and a watch found in Trayvon Martin’s school backpack last fall could not be tied to any reported thefts, the Miami-Dade Police Department said Tuesday.

The Miami Herald in its Tuesday editions reported that it had obtained a Miami-Dade Schools Police Department report that showed the slain teenager was suspended in October for writing obscene graffiti on a door at his high school. During a search of his backpack, the report said, campus security officers found 12 pieces of women’s jewelry, a watch and a screwdriver that they felt could be used as a burglary tool.

Martin’s fatal Feb. 26 shooting in Sanford, Fla., by neighborhood watch captain George Zimmerman has caused a national firestorm. His family and people at rallies all over the country have demanded the arrest of Zimmerman who says he shot the unarmed 17-year-old in self-defense. Martin was black and Zimmerman’s father is white and his mother, Hispanic. Martin’s family and their supporters believe race played a part in the decision not to charge Zimmerman.

The Herald reported that when campus security confronted Martin with the jewelry, he told them that a friend had given it to him, but he wouldn’t give a name.

Miami-Dade Police confirmed that it had been asked by school police to help identify the property. It said the jewelry did not match any reported stolen.