Authorities continue to investigate the circumstances surrounding a helicopter crash in Houston on Sunday evening that killed four people on board and sparked a massive flame within sight of homes.

Four people, including a child, were killed when a helicopter crashed into a radio tower in Houston, officials said.

The investigation spans an area of at least 4 acres, Houston Police Department Lt. Jonathan French told reporters on Monday. Power outages were reported in the area, Houston Mayor John Whitmire said Sunday. No residents were injured or vehicles damaged on the ground, French also said.