DEARBORN, Mich. -

The investigation into the pressure cooker discovered in a second-floor restroom at the Adoba Hotel has been closed.

The pressure cooker contained food remnants and is believed to have been left by a guest who used it to transport food to an event at the hotel. It is unknown whether the pot was left in the restroom inadvertently or as a prank.

"It appears that the appliance had been used initially for the purpose for which it had been manufactured," said Dearborn Police Chief Ronald Haddad. "We do not know the intent of the person who decided to leave it in the restroom but all proper precautions were taken to ensure the safety of hotel guests and first responders."

Hotel and banquet guests of the hotel were evacuated Sunday night after the pressure cooker was found and were allowed back inside around 1:00 a.m. after the building was determined to be safe. The evacuation was a precaution, as it was a pressure cooker bomb that exploded at the Boston Marathon.

Local 4 spoke with some of the guests during the evacuation.

"It was really terrifying because there were people up there and we were all really worried about the people still in the hotel," said Zara Hussein.

A banquet for the University of Muslim Association of America also had to be canceled and those guest also had to leave the hotel.

"I saw the police in my room saying, 'Move, move, move,'" said Nassar Ali.

Last year, the Adoba Hotel chain took over the hotel, which had been a Hyatt Regency property for many years.