PORTSMOUTH, N.H. (WHDH) -- Two teenage brothers were arrested after police uncovered a sophisticated drug dealing operation in Portsmouth, N.H.

“When you’re talking about Portsmouth, N.H. and you’re talking about kids moving serious drugs in our neighborhoods and communities, that’s a big deal for us,” said Dep. Chief Corey MacDonald of the Portsmouth, N.H. police department.

Police combed through evidence from a drug raid, which included everything from heroin to marijuana, pills and drug paraphernalia.

Police arrested two brothers, ages 15 and 16 years old.

“My reaction to it is just that it’s surprising that it’s coming from a 15 and 16 year old,” said MacDonald.

Police were tipped off by Homeland Security. Police said it appears the brothers were using money orders to purchase drugs overseas through the Internet.

“It appears to us right now that some of the drugs involved did come from international sources. That this is a pretty sophisticated effort,” said MacDonald.

The teenagers were arrested at an apartment they were living at with their mother. She has not been charged.

The students are juveniles so the court records have been sealed.

Police said the teenagers, who are students at Portsmouth High School, were dealing drugs to their classmates.

The school superintendent said they are working with police.

“We take any circumstance like the one [Tuesday] very seriously,” said Supt. Ed McDonough of Portsmouth Public Schools.

The principal of the high school sent out a letter concerning the arrest. Parents find it all troubling.

“You figure high school, maybe a little pot, a little alcohol. But it’s just incredible” said Michele Kaulback, a parent.

Detectives are going through the boys’ cell phones and their home computer looking for ledgers and lists to see if the brothers were working with others.

“If there are any adults that have any…responsibility in this we’re certainly going to pursue that,” said MacDonald.

Police aren’t ruling out the possibility that more arrests could be made.

The superintendent of schools said the brothers have been suspended and they face the possibility of expulsion.