British police have arrested a man in connection with a suspected chemical incident that sparked the evacuation of London City Airport last week.

Police said Monday they arrested the 25-year-old man on Saturday on suspicion of using a noxious substance to cause serious damage — an offense under counter-terror laws. He was released on bail pending further inquiries and an investigation is continuing.

Some 500 travelers and staff were evacuated to a parking lot Friday. The terminal was declared safe after a three-hour investigation.

The Metropolitan Police said a search uncovered a "CS gas spray," also known as tear gas, which causes stinging eyes and a burning throat.

East London's City Airport is the smallest of the British capital's international airports. It offers mostly short-haul flights to British and European destinations.