MARANA, Ariz. -- The Pinal Airpark near Marana was evacuated Wednesday afternoon after a foul odor was detected coming from a military crate from overseas, officials said.

The 30 foot by 10 foot crate was supposed to just have military equipment inside. But when Arizona's Army National Guard opened it up, they smelled what they thought was a pesticide.

It happened at the Army National Guard helibase where they keep their military helicopters.

Local fire department hazardous materials crews were called to the scene.

The helibase was evacuated but other businesses at the air park remained open.

When the crate was finally opened, nothing out of the ordinary was discovered.

"I don't believe there's any concern whatsoever at this point," said Capt. Peter Huble with the Guard. "Perhaps there was no real threat to begin with."