It was a great day to spend at Moraine State Park in Butler County on Sunday— except for some on the seven-mile bike trail.

A series of accidents — one involving a hit-and-run deer — befell three out-of-county residents, leaving two of them in need of hospital treatment, according to park officials.

At 2:30 p.m., a 61-year-old woman from Allegheny County's North Hills fell while riding an electric scooter just before Nealys Point. She was with her husband, who also was on a scooter

“She's not sure how it happened,” said Curtis Reynolds, a ranger.

She hit her head in the fall and suffered knee scrapes. Portersville EMS took her to Butler Memorial Hospital. Her condition was not known.

Reynolds noted that with the exception of certain electric-powered bicycles, no mechanized vehicles are allowed on the trail.

Less than an hour later, a deer ran into a 57-year-old Wexford woman riding a bicycle near Nealys Point, said Justin Flick, a ranger.

“She didn't know what happened,” Flick said.

The woman was knocked to the ground about 3:25 p.m. and left dazed. Her husband was riding ahead of her and did not see what happened.

Other bikers behind her saw the freak accident and rode up to tell her husband. They told him that the deer clipped her bike from behind, and then ran off. The husband called 911.

Flick said the woman was wearing a helmet, which apparently struck the ground. He noted there was a scuff mark on the helmet.

She did not have any visible injuries, but she was taken to Butler Memorial Hospital to be checked out, authorities said.

About 4:30 p.m., a 72-year-old New Castle man fell while walking by himself on the trail between Lakeview Beach and Barber Point, approximately three miles before where the deer struck the woman.

“He was walking and stumbled on the side of the trail,” Reynolds said. Passersby saw the accident and called 911.

The man was not injured, Reynolds said, “just a little disoriented.” His brother rode up on his bike about five to 10 minutes later.

Reynolds gave the man a ride back to his car, and he was on his way home.