Washington DC/IBNS, Jan. 30 -- US president Donald Trump has said the midair collision between American jet and Army chopper "should have been prevented" amid the ongoing efforts to rescue the people who were onboard.

An American Airlines Flight carrying 64 people collided with an Army chopper with three soldiers onboard midair near the Ronald Reagan Washington National Airport and both crashed into the Potomac River of Washington D.C. on Wednesday.

Eighteen bodies have been recovered so far. Many feared dead while no official confirmation has arrived yet.

The effort to rescue people from the river is underway.

About 300 first responders are searching for the bodies in the freezing river, said DC Fire chief John A. Donnelly.

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