CONCORD, N.H. — The New Hampshire Democratic Party lost phone service Monday on some or all lines at local campaign offices at 11 locations around the state.

Party Executive Director Michael Brunelle said two phone and Internet providers haven’t pinpointed the problem.

Service was affected in Concord, Manchester, Milford, Dover, Hampton, Nashua, Keene, Plymouth, Exeter, Londonderry and Somersworth starting at 1:30 p.m. Monday.

The party also alerted the state Attorney General’s Office as a precaution.

A 2002 scheme to disrupt Democrats’ get-out-the-vote efforts by jamming telephones with hang-up calls resulted in criminal convictions for a former state GOP executive director and a former political consultant. A lawsuit was settled with Republicans paying Democrats $135,000.