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Authorities are trying to determine why two men in a pickup truck ran a checkpoint at Davis-Monthan Air Force Base this morning, crashing into a traffic barrier aimed at stopping unauthorized base entry.

Terrorism is not thought to be a motive at this point, but military officials and civilian police hope to learn what prompted the pair to speed past the control gate at Swan and Golf Links roads without stopping for required identification checks.

Both occupants of the 1999 Dodge truck were taken to University Medical Center with serious injuries.

The men were not carrying identification and were unconscious when rescuers arrived at the traffic barrier, authorities said. Police have not been able to interview them.

“There is no indication at this time that they are tied to international terrorism,” Tucson Police Department spokesman Sgt. Mark Robinson said of the duo, who were described only as adult males.

But until authorities are sure, many details of the incident are being kept under wraps for security reasons, Robinson said.

Police are not commenting, for example, on the ethnicity of the driver and passenger, on who the vehicle is registered to or what color it is, and on whether there were any weapons on board. News crews also were not allowed to photograph the truck involved in the 6:45 a.m. incident.

Robinson acknowleged that it's unusual to maintain such secrecy around a vehicle accident.

But, in this case, he said, “this is not just a traffic incident. This was a vehicle trying to force its way onto a military base, and until we are 100 percent sure we just can’t comment on certain things."

The gate reopened around 12:30 p.m.