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A police officer stands at the scene at Ronald E. McNair Discovery Learning Academy after reports of a gunman entered the school, Tuesday, Aug. 20, 2013, in Decatur, Ga. A suspect was in custody after reports of gunfire at an Atlanta-area elementary school Tuesday, the school chief said, with television footage showing young students running out the school being escorted by teachers and police. Michael Thurmond told The Associated Press he had no reports of injuries and that all students and teachers are accounted for and safe. (AP Photo/David Goldman) ( Georgia School Shooting )

A police officer gives a high-five to students from Ronald E. McNair Discovery Learning Academy as they board school buses to take them to reunite with their parents as they were evacuated after reports of a gunman entered the school, Tuesday, Aug. 20, 2013, in Decatur, Ga. All students and teachers are safe and a suspect is in custody after gunfire was heard at the Atlanta-area elementary school today. (AP Photo/David Goldman) ( Georgia School Shooting )

Dekalb County Police SWAT officers run toward Ronald E. McNair Discovery Learning Academy after reports of a gunman entered the school, Tuesday, Aug. 20, 2013, in Decatur, Ga. Superintendent Michael Thurmond says all students at Ronald E. McNair Discovery Learning Academy in Decatur east of Atlanta are accounted for and safe Tuesday and that he is not aware of any injuries. (AP Photo/David Goldman) ( Georgia School Shooting )

Parents cheer as busses arrive with students after an incident at Ronald McNair Discovery Learning Academy, Tuesday, Aug. 20, 2013, in Decatur, Ga. Superintendent Michael Thurmond says all students at Ronald E. McNair Discovery Learning Academy in Decatur east of Atlanta are accounted for and safe Tuesday and that he is not aware of any injuries. (AP Photo/John Bazemore) ( APTOPIX Georgia School Shooting )

Nicole Webb cries as she talks on a phone in the parking lot of a store while waiting for her 9-year-old son, a student at Ronald E. McNair Discovery Learning Academy in Decatur, Ga., on Tuesday, Aug. 20, 2013. Superintendent Michael Thurmond says all students at the school east of Atlanta are accounted for and safe and that he is not aware of any injuries. (AP Photo/John Bazemore) ( APTOPIX Georgia School Shooting )

A police officer helps a child off a school bus carrying students after a shooting at Ronald E. McNair Discovery Learning Academy in Decatur, Ga., on Tuesday, Aug. 20, 2013. Superintendent Michael Thurmond says all students at the school east of Atlanta are accounted for and safe and that he is not aware of any injuries. (AP Photo/John Bazemore) ( Georgia School Shooting )

Authorities prepare at Ronald E. McNair Discovery Learning Academy after reports of a gunman entered the school, Tuesday, Aug. 20, 2013, in Decatur, Ga. A suspect was in custody after reports of gunfire at an Atlanta-area elementary school Tuesday, the school chief said, with television footage showing young students running out the school being escorted by teachers and police. Michael Thurmond told The Associated Press he had no reports of injuries and that all students and teachers are accounted for and safe. (AP Photo/Atlanta Journal-Constitution, Bob Andres) ( Georgia School Shooting )

Dekalb County Police SWAT officers run though the front yard of a home toward Ronald E. McNair Discovery Learning Academy after reports of a gunman entered the school, Tuesday, Aug. 20, 2013, in Decatur, Ga. Superintendent Michael Thurmond says all students at Ronald E. McNair Discovery Learning Academy in Decatur east of Atlanta are accounted for and safe Tuesday and that he is not aware of any injuries. (AP Photo/David Goldman) ( Georgia School Shooting )

Dekalb County Police SWAT officers prepare at Ronald E. McNair Discovery Learning Academy after reports of a gunman entered the school, Tuesday, Aug. 20, 2013, in Decatur, Ga. A suspect was in custody after reports of gunfire at an Atlanta-area elementary school Tuesday, the school chief said, with television footage showing young students running out the school being escorted by teachers and police. Michael Thurmond told The Associated Press he had no reports of injuries and that all students and teachers are accounted for and safe. (AP Photo/Atlanta Journal-Constitution, Bob Andres) ( Georgia School Shooting )

A police officer stands at the scene at Ronald E. McNair Discovery Learning Academy after reports of a gunman entered the school, Tuesday, Aug. 20, 2013, in Decatur, Ga. Superintendent Michael Thurmond says all students at Ronald E. McNair Discovery Learning Academy in Decatur east of Atlanta are accounted for and safe Tuesday and that he is not aware of any injuries. (AP Photo/David Goldman) ( Georgia School Shooting )

Students from Ronald E. McNair Discovery Learning Academy board school buses to take them to reunite with their parents after they were evacuated after reports of a gunman entered the school, Tuesday, Aug. 20, 2013, in Decatur, Ga. All students and teachers are safe and a suspect is in custody after gunfire was heard at the Atlanta-area elementary school today. (AP Photo/David Goldman) ( Georgia School Shooting )

A child peers out the window of a school bus as busses arrive with students after an incident at Ronald McNair Discovery Learning Academy, Tuesday, Aug. 20, 2013 in Decatur, Ga. Superintendent Michael Thurmond says all students at Ronald E. McNair Discovery Learning Academy in Decatur east of Atlanta are accounted for and safe Tuesday and that he is not aware of any injuries. (AP Photo/John Bazemore) ( Georgia School Shooting )