CONCORD, New Hampshire — Thirteen people have been arrested on drug charges in New Hampshire and Massachusetts as the result of a multi-month drug trafficking investigation among multiple agencies, authorities said Friday.

The people arrested range in ages from 27 to 56. Most were arrested on a charge of conspiracy to sell methamphetamine and were arrested in New Hampshire. One person was arrested in Massachusetts and another was arrested in Maine. Some were arrested in December, and others were arrested Thursday.

Authorities said the investigation accuses one person of supplying methamphetamine and cocaine to others. They said the drugs were distributed in the Concord area, Lakes Region, Hudson, and Maine.

It wasn’t immediately known if the group had attorneys. Some of the cases have scheduled court dates in March and April.