Pennsylvania-made tear gas fired at Egyptians in Mansoura. Photograph shared on Twitter by @simonjhanna

Pennsylvania-made tear gas fired at Egyptians in Mansoura. Photograph shared on Twitter by @simonjhanna

On Twitter, Simon Hanna shared this picture of a tear gas canister fired by police against protesters in Mansoura and commented:

@simonjhanna: Tear gas. Made in Pennsylvania, fired against Egyptians in Mansoura yesterday. #Egypt #Morsi #USA pic.twitter.com/ZH2KQPdqdy

According to media reports, clashes broke out between protesters calling for civil disobedience and those against it, as well as police.