BOSTON -- One person is dead after a three-vehicle crash in Littleton on Tuesday.

The crash happened just before 3 p.m. at the intersection of Ayer Road and Spectacle Pond Road in Littleton.

According to witnesses, a tanker truck hit a car, which slid into the guardrail. An SUV then rolled over swerving to avoid the crash. One person in the car was killed.

The cause of the crash is under investigation.