The methods used by Texas law enforcement and Border Patrol agents to pursue suspected undocumented migrants–which prompted 47 lockdowns at Robb Elementary School from February to May–caused Uvalde police and school administrators to react lackadaisically to the alarm sounded after an active shooter entered the school, according to the report written by investigators for the Texas state house, USA Today reports.

The frequency of these alerts led administrators, faculty and staff at the school to become complacent, and initially react slowly to the lockdown alarm sounded on May 24th when an 18-year-old gunman entered the building.  One of the first police officers on scene said that when he went to the school and didn’t see bodies in the hallway, he assumed the alarm was because of a bailout situation.

Whenever local, state and/or federal law enforcement agencies were pursuing suspected undocumented immigrants in the area, officials would order the school to go on lockdown, the report stated, particularly when those pursued “bail out” of a vehicle–often times after a high-speed pursuit and a crash–and run to evade capture.

The report noted that more than 90% of the lockdowns ordered at Uvalde were due to “bail out” situations even though those people being pursued were not on school grounds.  Political leaders said that the risk of undocumented migrants entering the school made the lockdowns necessary.  Such police chases have pushed fleeing vehicles and individuals into the Robb Elementary parking lot or grounds, and on at least one occasion, one of those fleeing had a gun, but there has never been an incident of violence by a fleeing migrant on Uvalde school grounds.

The commonality of “less-serious bailout-related alerts,” the report says, “diluted the significance of alerts and dampened everyone’s readiness to act on alerts.”