Students return to classes at Marjory Stoneman Douglas High School

Nelson Laboy hugs his mother, Camille Aponte, after making their way to the entrance of Marjory Stoneman Douglas High School.

Supporters hold signs as students head back to classes at Marjory Stoneman Douglas High School in Parkland, Fla.

Well wishers greet law enforcement as students head back to school at Marjory Stoneman Douglas High School in Parkland, Fla.

Broward County Sheriff’s officers welcome students at Marjory Stoneman Douglas High School as they return for the first time since the shooting that killed 17 people.

Police walk outside Marjory Stoneman Douglas High School in Parkland, Fla., as students returned to class for the first time.

People hug each other as students arrive at Marjory Stoneman Douglas High School for the first time since the Feb. 14 shooting that killed 17 people in Parkland, Fla.

A student holds a flower and a button that reads #MSDSTRONG as she arrives for classes at Marjory Stoneman Douglas High School.

Students wait at a crosswalk as they arrive to attend classes at Marjory Stoneman Douglas High School for the first time since the Feb. 14 shooting that killed 17.

A police officer walks a dog at Marjory Stoneman Douglas High School in Parkland, Fla.

Students wait at a crosswalk as they arrive to attend classes at Marjory Stoneman Douglas High School for the first time since the shooting.