Mojave High School, Elizondo Elementary School and three other schools in North Las Vegas were placed in lockdown after a person described as a nonstudent dropped a small-caliber semiautomatic handgun in the high school quad before school began this morning.

North Las Vegas police and Clark County School District police were searching the neighborhood for the young man, who authorities said attended the high school last year.

The incident happened about 6:58 a.m., authorities said. The lockdown was lifted at the three other schools — Watson Elementary and Findlay and Johnston middle schools — later in the morning. No one was injured in the incident, police said.