Police say a bus passenger in Maine was seriously injured after climbing up onto the roof of the moving vehicle and then falling down onto Interstate 95.

The incident happened Friday morning on board a Concord Coach Lines bus that was headed from Portland, Maine to Boston's South Station . Maine State Police said that a New York man identified as 35-year-old Derrick McDuffy apparently decided to go up on the roof as the bus passed through Kittery at about 11 a.m.

"Witnesses reported that McDuffy stated he was feeling overheated and opened the bus's emergency roof access hatch before climbing onto the roof while the bus was in motion," State Police said.

The bus driver realized what was happening and started to slow down and pull over, State Police said. That's when McDuffy fell

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