(Bill Green/Frederick News-Post via AP) 
 
 Authorities in Frederick County expanded their investigation Thursday into a shooting outside a high school that left two teens wounded as a basketball game was played inside. Lt. Joe Hayer, a spokesman for the Frederick police, said officers were searching the grounds of the two schools Thursday “for any evidence that will help generate new leads.” He added that the “suspects are unknown at this time.” On Thursday night, Frederick police said in a statement that they believed the shooter knew the victims. 2 teens shot @nbcwashington pic.twitter.com/uu4c0iTkJv — Shomari Stone (@shomaristone) February 5, 2015 
 
 Frederick High School, on the city's west side, has about 1,300 students. In a six-minute video posted on YouTube, two school officials — Theresa Alban, the county schools superintendent, and Brad W. Young, the school board president — explained that the basketball game was underway when the shooting occurred outside the gymnasium. Richard Hetherington said. Two junior varsity basketball games were going on at the time of the shooting, bringing students from at least two other high schools on campus, Frederick County public schools spokesman Michael Doerrer said. 911 Operator in Fatal Crash: "Stop Whining" 
 
 The two injured students, who did not attend Frederick High School, were flown to a hospital in Baltimore. Hetherington did not know the students' ages or genders. Theresa Alban, the superintendent of the county school system, and Brad W. Young, the school board president, responded to Wednesday's shooting at Frederick High School. The shooter or shooters are believed to have fled the scene on foot, and police believe the victims were targeted. Officers took about 200 people who were at the game into the school cafeteria, secured the building and questioned witnesses, Hetherington said. Frederick High School junior Sofia McCluskey told the Associated Press that she was watching the game and heard a muffled shot. Police said they're investigating a range of possibilities regarding the motive behind the shooting, including reports from students that it could be gang-related or stem from a rivalry between the two schools playing in the game. Dejuan Jones, a sophomore, said, "You would expect it to happen at a varsity game, but it was like a JV game," he said. Pray for those involved.” 
 
 Clarence Williams contributed to this report. Frederick County Public Schools announced the incident on Twitter: "Earlier this evening, two students were wounded in an incident at Frederick High. He said additional security would be provided at several campuses Friday “to reassure people that our schools are safe.” 
 
 The scene at the high school was chaotic when police arrived Wednesday night. FoxNews.com's Karl de Vries and The Associated Press contributed to this report.
– Two teens were shot outside a basketball game at Frederick High School in Maryland last night, and as of this morning police were still looking for the shooter or shooters, who are believed to have escaped on foot. "Gunshots going off around a gym packed with kids," is how a police officer described the 8pm scene. "You can imagine, everybody's running." Students told investigators they saw four or five males in big coats, hands in pockets, walk into the gym during the game and leave just before shots were fired, NBC Washington reports. The victims were boys aged 14 and 15, but it's not clear what school or schools they attend, the Washington Post reports. Police are looking into various motives—possibilities include gang-related violence or a rivalry between the two teams (the other school playing was Gov. Thomas Johnson High, the Baltimore Sun reports). "You would expect it to happen at a varsity game, but it was like a JV game," one sophomore tells Fox News. "Nobody hardly comes to those." The injuries to the two students were not believed to be life-threatening. The rest of the students at the school were released after a two-hour lockdown; the high school as well as a nearby middle school are closed today. Frederick has been named one of the most secure American cities, and Frederick County borders some of the richest counties in the US.