Three Garland ISD students accused of posting school shooting threats to social media Tuesday have been charged with making terroristic threats.

Timothy Young (Garland Police Department)

Police were told of the first threat, to North Garland High School, shortly before 9 a.m., spokesman Pedro Barineau said. While they were investigating, they were told of a second threat, against Naaman Forest High School.

Later in the day, students reported that a third student was streaming a live video on Snapchat in which he threatened to use gas and guns to attack schools, Barineau said.

Timothy Young, 17, was charged with making the third threat. He and a 15-year-old student, who is not being named due to age, were taken into custody Tuesday. Another 15-year-old was taken into custody Wednesday.

Police don't believe the three coordinated the threats or were in contact with each other.

The threats are unrelated to a screenshot of a threat from earlier in the school year, which was posted on several community boards over the weekend.