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Alec Baldwin and his brother Stephen were involved in a car wreck Monday, smashing a Range Rover into a tree in the Hamptons ... and local police confirm Alec's explanation of what happened on the rainy neighborhood street.

Alec took to Instagram yesterday to give his side as to what happened when he crashed his wife's SUV ... explaining he and Stephen were in town for the Hamptons Film Festival when the crash happened. Play video content

East Hampton Police Chief Michael Sarlo tells TMZ ... "At approximately 12:01pm on Monday, October 13, the EHTPD responded to a motor vehicle accident on State Route 27, Pantigo Road near Cross Highway. A white 2023 Range Rover, operated by Alec Baldwin, with passenger Stephen Baldwin, was found to have struck

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