COUNCIL BLUFFS, Iowa (AP) — A hotel in western Iowa had to be evacuated for several hours after carbon monoxide levels spiked in the pool area and several guests became dizzy. KETV reports two people were taken to the hospital for treatment and two others needed oxygen at the Council Bluffs hotel.

Firefighters say carbon monoxide levels in the pool area of the Quality Inn and Suites motel were dangerously high Sunday. Authorities say a malfunctioning pool heater appears to be the source. Guests were allowed back in the hotel after the carbon monoxide was cleared out.