A 14-year-old girl and 13-year-old boy were killed on Thursday, after a pickup truck carrying four teenagers went off a road near Chipman, N.B., and ended up submerged in water.

Two other boys, believed to be between 13 and 18, were taken to the hospital with undetermined injuries.

Barry Armstrong, Chipman's deputy fire chief, was among the first on the scene.

"One member from the ambulance attendants and one from the RCMP tried to get in the water, and did obviously. But there was really nothing they could do. The water was too cold," he said.

Rescuers towed the truck up the steep embankment. Responders reached inside the cabin to help the kids.

"It was obvious, with one of the victims, there was nothing we could do. And with the other one, we were trying to do our best to save that person's life. So CPR and everything that anybody could do was done all the way up the embankment, on the road and in the ambulance to Fredericton," Armstrong said.

RCMP say the truck lost control and went down a 10-metre embankment before landing on its roof in a pond. (Redmond Shannon/CBC)

Police believe the driver lost control of the vehicle on Roy Mills Road at about 11:30 a.m.

The truck carrying the four teenagers then left the road, went down an embankment and landed in a pond, said RCMP Const. Derek Black.

The girl died at the scene, said Black.

The boy was later pronounced dead at the hospital, he said.

The names of the victims are not being released until their relatives have been notified, said Black.

A local volunteer firefighter, who was among the first on the scene, was visibly upset, reported CBC's Redmond Shannon.

The firefighter said everyone in town knows the families of the teens.

Several members of the community gathered at the scene and looked on as RCMP continued to investigate with the help of a collision reconstructionist.

Tire tracks are visible on the dirt road and down the steep, estimated 10-metre embankment, said Shannon.

Clothing believed to belong to one of the boys is scattered at the scene, along with an empty package of McDonald's french fries, he said.

Rubber surgical gloves and neck brace packaging is also visible among the brush.

A tow truck pulled the dark-coloured Ford pickup truck out of the pond and up the embankment.

Ambulance New Brunswick and the Chipman Fire Department also attended the scene.