BAYTOWN, TX – Goose Creek Memorial High School was placed on lockdown Monday morning after two knives were found in a U-Haul on campus, according to Goose Creek CISD.

In a letter to families, district officials said a parent drove the U-Haul onto campus and left it there. The knives were in the cab and could be seen from outside the vehicle. The cargo area was empty, officials said.

Police later found the parent unarmed. The district said he had not entered the school and cooperated with officers. Police arrested him for criminal trespass.

Officials did not immediately release the parent’s name.