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A lockdown has been lifted at San Leandro High School Wednesday afternoon after a school shooting threat was written on a bathroom wall in what appeared to be permanent marker.

News of the threat came as thousands of students across the Bay Area were participating in a national 'March for Our Lives' walkout to urge congress for tighter gun control laws in the wake of the Parkland, Florida school shooting.

A photo posted on Instagram shows the alleged graffiti threat which shows writing on a bathroom stall stating, "I'm shooting the school tomorrow (Thursday) at 1. I'm sick of this sh*t. Better not come. F**ck this place."

San Leandro Unified School District Superintendent Mike McLaughlin says the school will be closed Thursday as a precaution, "unless we notify you otherwise."

Lt. Isaac Benabou with the San Leandro Police Department says the graffiti was found in a boys' bathroom on campus Wednesday morning. The school was placed on lockdown and the school was searched. "We brought in police department staff and we systematically searched the school. We also brought in some K-9's to search the hallways, and do a very comprehensive search the best we can to ensure the safety of the school, students and staff. However this message was written with the intended violence to take place tomorrow. We didn't want to take the chance and have this take place tomorrow. We decided to work with the school and clear the grounds today - just as a precaution," said Lt. Benabou.

There were rumors that a gun or guns were found on campus. However, authorities say those rumors were not true, and there were no guns found on campus.


The district says all students and staff are safe. Students will be dismissed at their regularly scheduled time Wednesday.