CAP-HAITIEN, Haiti—Demonstrations in Cap-Haitien turned violent on Thursday as gunshots rang out while supporters of slain President Jovenel Moïse blocked roads and demanded justice while threatening to disrupt his upcoming funeral.

A heavily armed police convoy carrying unknown officials rushed through a barricade of flaming tires set up at the end of a bridge, with one vehicle nearly flipping over as it passed through.

“This is real messed up since Jovenel died,” said David Daniel, who stood in the doorway of a restaurant he co-owns as he watched the scene unfold. But he said he doesn’t think the unrest will have the effect demonstrators intend. “Violence has been here in Haiti since I was a kid, so I don’t think violence is going to change anything.”

Earlier on Thursday, a priest told mourners at a memorial service Thursday that too much blood is being shed in Haiti as authorities warned of more violence ahead of his funeral.

The Rev. Jean-Gilles Sem spoke to dozens of people wearing white T-shirts emblazoned with Moïse’s picture.

“The killings and kidnappings should stop,” he said, noting that poor communities are the most affected. “We’re tired.”

The Mass at the cathedral in the northern coastal city of CapHaitien was about half-full and Moïse supporters kept interrupting as they cried out and accused Haiti’s elite of killing the president.

A man who identified himself as John Jovie stood outside the church with a group of men and threatened more violence if wealthy members of the elite from the capital of Port-au-Prince showed up for the ceremonies.

“We ask them not to come to the funeral,” he said. “If they come, we will cut their heads off. We will bring our guns out of hiding. …We want justice for Moïse.”

The mayor of Cap-Haitien arrived at the cathedral with heavy security as men with high-powered weapons stood watch during the entire Mass.

Nearby, some people signed a blue condolences book that the mayor’s office had set up next to the cathedral as well-wishers stood before a portrait of Moïse and rows of candles whose flames flickered in the hot wind.

“My President. Go in peace. God sees everything. Fight for change,” wrote Louis Judlin, a 36-year-old electrician and father of two.

He said he is unemployed and struggles to find food to feed his children. “Life is truly hard for every Haitian. To eat, to go to school, to have health, transportation,” Judlin said.