A Northern Maine man was killed when he lost control of his motorcycle while trying to pass another bike. In Somerset County, a 60-year-old was killed while trying to pass another bike.

Caribou Police say a 40-year-old man was killed Monday when he lost control of his bike on Route 89 in that town. Colin Campbell was traveling east when he tried to pass another motorcycle that was attempting to turn left onto the Madawaska Road. It's not clear exactly what happened but Campbell, who was not wearing a helmet, was ejected when he laid his bike down.

In Somerset County, the Sheriff's Office says a 60-year-old man died Sunday from injuries he received in a crash on August 30th. That wreck was on Route 2 in Mercer. Clifford Webster of Massachusetts was trying to make a right-hand turn when the crash happened.

These two deaths are in addition to the four people killed in three separate motorcycle crashes in Maine over the weekend, that happened in Falmouth, Lebanon, and Hiram. The Caribou crash means that five people died on Maine roads during Labor Day weekend - all on motorcycles.

The Maine Bureau of Highway Safety says this will be the deadliest year for motorcycle deaths since 1991 when 34 people died from bike crashes. Both 2012 and 2009 ended with 24 motorcycle deaths each.