CHICO, Calif. -

A frightening situation happened at a US Bank branch in downtown Chico when police responded Tuesday morning thinking it was being robbed, but it turns out it was just an irate customer.

A 25-year-old woman went inside the bank to discuss her account, and according to police, she got  extremely angry when she thought there should be more money in it.

Police swarmed the entire bank, and detained the 25-year-old woman after they evacuated everyone inside around 11 a.m.

Police revealed the woman has mental health issues and started yelling inside the bank about her account.

Bank employees then called Chico police, and thought the 25-year-old was robbing the bank.

Once all the employees were evacuated, police called the woman on her cell phone and she came out quietly.

"Keep in mind this all happened within seconds or minutes,” said Sgt. Cesar Sandoval of the Chico Police Department. “Somebody has to make a decision. They made a good decision to call us, which was the right one. We then took it one step at a time and dealt with the situation."

Police said the woman did not have any weapons on her and did not threaten or demand anything.

The woman was not arrested but she was taken to the Butte County Mental Health Facility for evaluation.

No one was hurt.