(CNN)A dark intersection. A church van full of parishioners. And tragedy. 

That's about all police in Glades County, Florida, had to work with early Monday, hours after a van with 18 people inside ran a stop sign, crossed a four-lane highway and plunged into a shallow water-filled ditch. Eight people died. Ten others, including a 4-year-old child, were injured, according to police. 

Investigators don't know why it happened, Florida Highway Patrol spokesman Lt. Greg Bueno told CNN affiliate WPBF. The driver died, and police haven't been able to interview passengers yet. 

"Our hearts go out to the families of the victims," Bueno said. "It breaks your heart to see something like this happen." 

Some relatives of the crash victims, all of whom were from the Independent Haitian Assembly of God in Fort Pierce, gathered at the rural intersection Monday morning. Others went to the church. 

"We've lost a lot of family members, church family," Phillipe Dorce, who said he lost his father, told WPBF. "All we can do is pray (to) God to help us out. Pray for us. It's very sad for us." 

Linda Dolce told the news site TCPalm.com that her grandmother died in the crash. She'd arrived from Haiti six years ago. 

"She loved singing and helping people," TCPalm.com quoted her as saying. "She was exciting; she was the best lady to us." 

Laura Lochard told the site that her uncle died in the crash, leaving behind four children, the youngest of which is 16, whom he brought to the United States from Haiti. He was like a father to her, too, she said. 
What country did some of the people come from?
Haiti