Officer Adam Fowler of the Seattle Police Department says he nearly lost the vision in his left eye when he was hit in the face with the blast of a fireworks mortar Sunday.

“These aren't tiny fireworks, they're not firecrackers, they're commercial-grade mortars… they should be launched hundreds of feet in the air in a safe place to be detonated to put on a fireworks display. They're not meant for weapons," he told King 5.

The attack occurred during an anti-police union demonstration in the city's SODO neighborhood. Later in the night, the demonstration was deemed a riot by Seattle police.

Six officers were injured, and 18 people were arrested during the riot.