MONTGOMERY COUNTY, Texas -

The Montgomery County Sheriff's Office is investigating a bank robbery after three armed men barged into a Chase bank and held customers and employees at gunpoint.

Detectives say the takeover-style robbery happened around noon at the Chase Bank on West Panther Creek Drive.

For hours Luis Montes and his family stood outside the Chase bank waiting to see his sister.

"She was shaken up and crying," said Montes. "I was just hoping she was OK, money can always get replaced but I am happy no one was hurt or injured."

Montes' sister called to tell him she was OK, but that three masked gunmen had held up the bank where she works.

Authorities said the men were basically completely covered, wearing dark clothes, long sleeves and masks.

"One of the tellers, they demanded her to open the vault, they took the safety off one of the guns and put it to her head and told her she had five seconds to open it up," Montes said.

The gunmen were able to get into the vault and got away with an undisclosed amount of cash. Witnesses said they saw them speed away in a Gold Ram 1500 toward the Woodlands Parkway. There were customers and employees inside the bank but no one was hurt.

Investigators are looking through surveillance video trying to identify the three robbers.