Around 2,000 protesters blocked car ferries from crossing the Suez Canal after a court ruled that 21 soccer fans would be sentenced to death, witnesses told Reuters.
Protesters reportedly also untied moored speedboats used to supply shipping in a bid to disrupt passing vessels.
Military police recovered five boats and brought them back to shore in Port Said, but two were still drifting, one witness said.
More top news
Milder for most of us
In her Brexit speech on Tuesday, the Prime Minister is set to urge the EU to forge a fair trade deal or risk commercial war.
B-Street Band want to remain respectful to Bruce Springsteen, who supported Hillary Clinton in the US Election.