The incident took location soon after 1pm neighborhood time (8pm GMT) on Saturday.
However, the airplane carrying 231 travellers and 10 crew on board, was in a position to land safely and securely at Denver airport with no accidents described.
Police in the city of Broomfield posted images on Twitter, such as an picture of what seems to be the entrance of an motor casing in the backyard garden of a house.
The Broomfield Police Office also shared images of debris scattered across a turf field and advised people today to keep away from the spot.
Broomfield Police urged citizens not to touch or transfer the debris.
A person of the travellers onboard instructed AP information agency that the pilot was offering an announcement when the explosion was read.
“The airplane begun shaking violently, and we missing altitude and we commenced going down,” David Delucia reported.
He added that he and his spouse placed their wallets in their pockets so that “in scenario we did go down, we could be ID’d”.
The Federal Aviation Administration (FAA) verified that the United Airlines airplane was bound for Honolulu and suffered a failure in its proper-hand motor.
The FAA and the Nationwide Transportation Security Board explained they will be carrying out an investigation.