INDIANAPOLIS - Two students were arrested at a Lawrence middle school -- one accused of attacking staff members and another who brought a knife to school, police said.

The incidents happened Friday at Fall Creek Valley Middle School.

Police said a 13-year-old boy lunged at his teacher and head-butted him following an argument, and then shoved the school principal.

Security officers and the teacher later calmed the boy down.

Another 13-year-old was arrested after he bragged about bringing a knife to school and threatened to cut other students, police said.

Both students have been placed in juvenile detention.