Glenn Baxter, his wife Danica and his three children died early Sunday morning after their SUV crashed into Tempe Town Lake

A father intentionally drove his wife and three young children into an Arizona lake over the weekend in an apparent murder-suicide, police said Monday evening.

Glenn Baxter, his wife Danica and their three children Reighn, Nazyiah and Zariyah all died on early Sunday morning after their SUV crashed into the Tempe Town Lake. But Tempe police are now saying the crash was no accident.

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“Mr. Baxter took deliberate action,” police spokesman Michael Pooley said, according to the Associated Press. “It’s absolutely horrific what happened to those little kids and their mother.”

Witnesses reported seeing an SUV drive at full-speed into the Tempe Town Lake at around 12:15 a.m. on Sunday morning.

A fisherman dove into the lake to try and save the family. He was joined by officers from the Tempe police department, but they were unsuccessful and all five family members died.

The children’s great-grandfather previously told the AP that Baxter and Danica were estranged and that he doubted the crash was accidental. “She is never up at that time of the night,” George Britt said. “Never, never.”

Surveillance footage from Sunday shows Baxter getting out of the car to inspect the barriers at the lake’s edge before he gets back in to the car and drives “at a high rate of speed” towards the lake, Pooley said. The car then flips over the barrier and into the water.

Police said that they found a handgun inside the SUV, but it’s unclear whether Danica and the children were forced at gunpoint into the car.

Danica’s aunt, Tamika Franklin, said the mom would have done anything for her young chilren. “Everything she did was for her kids. Her kids were her life. She would never do anything to hurt her kids,” she told the AP.

Franklin added: “I can’t explain it. It’s hard burying anybody but to bury a whole family at once, I just don’t understand it.”