Employees were evacuated from a Chase bank Monday at the intersection of 36th and Robinson Streets after an employee opened a letter that said it contained hazardous chemicals, police said.

FBI special agent Gary Johnson said the letter stated that the person who opened the letter had been subjected to a harmful substance and would die.

Capt. Leonard Judy said the 10 employees who came in contact with the letter were sprayed with water in the bank’s parking lot in an attempt to wash off any potential contaminants, but officials do not believe anyone was harmed.

One person was transported to Norman Regional Hospital, Judy said. He said the person complained of discomfort, but there are no signs that the discomfort was the result of any hazardous substance that may have been in the letter.

The letter was opened at about 11:18 a.m.

Chase bank is taking the threats seriously and working closely with law enforcement, said Greg Hassell, a spokesman for Chase bank. He said no serious injuries have been reported.

Judy said police are not sure if there were chemical agents in the letter but are proceeding on the assumption that the note contained hazardous materials.

“The substance of the letter was threatening in its tone,” Judy said.

Two Chase branches in Oklahoma City, located on May Avenue and Northwest 63rd Street, also received a threatening letter, as well as branches in Denver, Colo., said Greg Hassell, a spokesman for Chase bank. He could not confirm whether the other banks had been evacuated.

The Norman branch will be open Tuesday.

The Northwest 63rd Street location re-opened Monday, but a representative at the May Avenue location declined to confirm whether the branch was re-opened Monday.

The FBI, Oklahoma National Guard Civil Support team, federal postal inspectors, police, firefighters and paramedics responded to the situation in Norman.

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— Caitlin Harrison, Will Holland and Nanette Light contributed reporting.