6 p.m. UPDATE: Judson Independent School District spokesman Steve Linscomb confirmed that the 17-year-old girl who sent texts to a Madison High School student claiming there were weapons on the Madison campus is a Judson High School student.
In a statement issued by Linscomb Tuesday evening, the female student admitted to sending the threatening texts. Linscomb said during the investigation, authorities traced the texts back to the female Judson student's phone.
Linscomb said while charges are pending, she will be subject to administrative disciplinary action.
"The Judson ISD does not tolerate such behavior," Linscomb wrote in the statement. "Threats like this, however harmless a student may think they are, have no place in the classroom or anywhere else."
5:35 p.m. Northeast Independent School District officials now say that the person who sent a text to a Madison High School student prompting the school to go into a "soft lockdown" Tuesday morning was a girl that attends school in another district.
NEISD spokeswoman Aubrey Chancellor said the 17-year-old student sent the text message to a male Madison student, claiming there was a weapon somewhere on campus.
The Madison student did not recognize the girl's phone number and immediately told his teacher about the text, Chancellor said. She said one text message reported the weapon and a follow-up text joked about the school's subsequent lockdown.
NIESD police and a K-9 unit searched the campus but did not find any weapons. The soft lockdown -- in which classes continued as usual but no one was allowed to go in or out of the buildings -- was lifted about two hours later.
Chancellor said the 17-year-old female student who sent the text messages will be prosecuted to the fullest extent of the law and that it is not believed that the Madison student who received the messages had any knowledge of the prank or who sent them.
Her name has not been released.
On Tuesday afternoon, NEISD Superintendent Brian Gottardy sent out a letter to parents, saying in part: "I am happy to share that school administration, as well as district and local police worked together to ensure that the situations on both days were quickly contained and no one was hurt in the process. The district has specific measures in place to ensure that every threat is thoroughly investigated and that students are protected."
Tuesday lockdown comes 1 day after previous lockdown
Tuesday's lockdown came almost exactly one day after 17-year-old Madison sophomore Brendan Tarwater was caught with three loaded weapons on the campus. The school was placed on lockdown for an hour and a half while police searched the campus.
Two handguns and some knives were found in Tarwater's backpack and district police found an AK-47 in a bathroom. Tarwater told district police he planned on using them if certain demands were not met.
Tarwater was charged with possession of weapon in prohibited places, a third-degree felony, and terroristic threat. Bond for each charge is $150,000.