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.

NTSB says they are in the early phases of their investigation into the deadly helicopter crash and collecting evidence from the scene in Houston’s Second Ward.

The moment a helicopter crashed into a radio tower in Houston was caught by a security camera. 25 iconic actors who starred in commercials before they were famous If you always use these 6 phrases, you're mentally stronger than most Switzerland gives up neutrality Black,

Four people were killed, including a child, when a helicopter crashed into a Houston radio tower Sunday. The NTSB is investigating the crash. CBS News transportation safety expert and analyst Robert Sumwalt has more.

CCTV footage showed the moment a helicopter crashed after hitting a radio tower in Houston on Oct. 20. ↓ Read More

Officials surveying the aftermath of a deadly helicopter crash in Houston on Sunday are looking into the possibility that the aircraft struck a radio tower because its warning lights were not working.