GREENLAND, N.H. (AP) -- One police officer was killed and four others were injured in a shootout in a small New Hampshire seacoast town of Greenland on Thursday when an suspect fired on officials entering the home while conducting a drug investigation.

State Attorney General Mike Delaney said the shooter and a woman remained holed up in the home around 10:30 p.m., about four hours after the initial confrontation.

"We are working with federal state and local law enforcement to try to obtain a peaceful resolution," he said late Thursday. "I do want to extend my thoughts and prayers to families and relatives and loved ones of the police officer that has been killed and the four police officers that have been injured."

Streets all around the home were blocked off and officers stood at roadblocks in the pouring rain.

State police and officers from many departments responded to the community of about 3,500, about five miles from Portsmouth.

The names of the officer killed and those injured were not immediately released because their relatives had not all been notified.

Greenland has just seven police officers, including Chief Michael Maloney.

John Penacho, chairman of the town's Board of Selectman, confirmed that Maloney was part of the investigation but would not say if he was among those shot. Maloney is due to retire in less than two weeks.

"It's a blow to all of us. You're stunned. It's New Hampshire, it's a small town," he said. "We're stunned. I mean all of us. It's an unbelievable situation."

Delaney said he couldn't provide much other information about the shooting.

"We do have an active armed standoff at a home and were simply not going to provide any information right now that may jeopardize that situation," he said.

Gov. John Lynch was at Portsmouth Regional Hospital, where the officers were taken.

"This is a tragic incident, and my thoughts and prayers are with the officers involved and their families," he said.

The town's schools will be closed Friday, because law enforcement officers are using the elementary school as a staging area.

Asked what the town will do to help residents cope with the tragedy, Penacho said "We'll do whatever we need to do."

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Associated Press Writer Norma Love in Concord contributed to this report.