WASHINGTON -- Nationals president Stan Kasten met with the media on Saturday to express his sadness at the news that a fan was killed on Friday night on the way from RFK Stadium to Nationals Park.

According to a Washington Post article, a two-deck, open-top bus was transporting fans from the parking lot at RFK -- used to alleviate concerns over a lack of parking around the new stadium -- to Nationals Park around 8:45 p.m. ET. Two men were standing on the top deck when the bus passed under the 11th Street overpass, and both struck their heads on the overpass. One man was killed in the accident and one was critically injured.

Though he had few details about the incident, Kasten said he and the Nationals' organization wanted to express their sympathy for the families of the accident victims.

"The Nats are terribly saddened by last night's event," Kasten said. "Our thoughts and prayers go out to the families of all involved. I don't have details for you, as I said, because I still have many questions that I don't have answers to yet."

Kasten followed that statement by saying he didn't want to give unclear or "incomplete" information about something "that is this important and this sensitive."

According to Kasten and the report, Metropolitan Police and accident investigators are still looking into the matter.

"It was a bus that was being used to transport people from RFK to the game," Kasten said. "We do contract with an outside party to provide that service, but there are several entities involved, so I don't want to get into any details without them being completely correct."

The bus was part of the shuttle service offered by the Nationals from RFK to Nationals Park. Kasten said the shuttle service is contracted out by the team to provide fans the service.

Saying that he would make details available as they became clear and concrete, Kasten again emphasized the Nationals' sympathy for all involved in the incident.

"The most important thing I can say is how badly we all feel about this horrible tragedy, and again expressing our thoughts and prayers for the families of those involved," Kasten said.

He also indicated that open-top buses were not being used on Saturday night.