COSTA MESA – Four people were taken to area hospitals after complaining of headaches and having difficulty breathing inside a 99 Cents Only store, authorities said.

When firefighters went inside, they found high levels of carbon monoxide, said Capt. Chris Coates of the Costa Mesa Fire Department.

About a dozen employees were inside the store, at 2180 Harbor Blvd., when firefighters evacuated the building.

Officials believe the fumes were produced from three generators running inside the store, Coates said. A power outage was reported earlier in the day, which is why the generators were being used.

Firefighters arrived at the store at 8 a.m. At 10:30 a.m., the store remained closed.

More details to come.

Contact the writer: shernandez@ocregister.com or 949-454-7361

&amp;nbsp;&amp;nbsp;&amp;lt;p&amp;gt;Your browser does not support iframes.&amp;lt;/p&amp;gt;