BELFAST — Another teen-age girl has been arrested in connection with Tuesday’s bomb threat at the Belfast Area High School and a similar threat at the Troy Howard Middle School last June.

Police Chief Allen Weaver said the 15-year-old Belfast girl was arrested Thursday on two counts of terrorizing. She was taken to the Waldo County Jail and is scheduled to appear before a juvenile court judge in Belfast today.

The arrest marks the second in two days after bomb threats were made at the high school. A 14-year-old girl was arrested Wednesday and charged with Tuesday’s bomb threat as well as the one at the middle school last year.

That juvenile also was charged with two counts of terrorizing, a Class C crime.

Both bomb threats resulted in the canceling of classes and the evacuation of both schools.

Within the same time frame of the 14-year-old’s arrest Wednesday, police were alerted to a bomb threat at the middle school.

The threat was contained in a message scrawled on a boys restroom wall that said, “I’m going to blow the school up ….”

The threat was discovered as the school buses were arriving at the end of the day. The school was evacuated and all activities canceled for the rest of the day. A subsequent search found no evidence of any explosives, Weaver said.

Tuesday’s bomb threat at the high school was the second in two days. On Monday, a threat was found on a telephone message made to the athletic department Sunday night. Tuesday’s threat involved five notes that were left in various locations within the high school.

The notes contained the same threat that was left on an administrator’s answering machine the day before — that a bomb had been planted in the school and would explode at noon.

Officials evacuated the high school on both days and conducted thorough searches of the building. No devices were found during either search.

Weaver emphasized that the two girls were being charged only in connection with the Tuesday bomb threat and the threat at Troy Howard.

Weaver said his officers were still investigating Monday’s threat at the high school and Wednesday’s threat at the middle school.

“We’re working very hard on this,” Weaver said. “The investigation remains open. We’re still pursuing it vigorously.”