Just as they have for 104 years, Portland and South Portland firefighters lined up Sunday to remember their own.

In 1911, the first year a ceremony was held, there were just three firemen to remember. On Sunday, the departments honored 20 Portland firemen and two South Portland firefighters who have died in the line of duty since 1903. Gov. Paul LePage ordered all flags on public buildings and grounds be flown at half-staff in honor of the National Firefighters Memorial Weekend.

Sunday also kicked off Fire Prevention Week. The South Portland Fire Department will host an open house at its Central Fire Station at 684 Broadway from 11 a.m. to 3 p.m. Saturday.