A high school student who allegedly took a loaded gun to his Montgomery County, Md., school last week reportedly had a list of grievances against other students and multiple weapons at home.

Eighteen-year-old Alwin Chen was arrested last Thursday after bringing a loaded handgun and a knife to Clarksburg High School.

According to multiple news reports Tuesday, he also had an AR-15-style rifle, grenades, land mines and a tactical vest at home, along with other weapons. According to law enforcement officials, a list of grievances about the school and classmates was also found on the shooter at the time of arrest.

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Chen has been charged and is being held on without bail as police continue to investigate his motives, FOX 5 DC reported.

BREAKING: MoCo Police located the following items in home of Clarksburg HS student who allegedly brought handgun to class last week:



•AR-15 style rifle

•Multiple grenades

•Detonator for C4 land mines

•Additional guns

•Tactical vest

•List of grievances re: students/school pic.twitter.com/oBo71QoFVH — Kevin Lewis (@ABC7Kevin) February 20, 2018

The incident came just one day after the mass shooting at a South Florida high school that left 17 dead and 14 others injured.

Law enforcement across the country have been on alert for copycat attempts after the Florida shooting.

The suspected Florida shooter used a semiautomatic rifle, a gas mask and smoke grenades in his attack and had been flagged as a threat before the attack.