A woman deliberately crashed her vehicle into Michigan's Kalamazoo River, killing herself and her nine-year-old twin daughters, local police said on Tuesday.

Kalamazoo police said they had found two bodies inside the submerged vehicle in the Kalamazoo River on Monday and later found the third, in what authorities called a suspected murder-suicide.

There were four children believed to have initially been in the car with the mother, 44, but police told DailyMail.com that two children who were also related to the woman had been dropped off before the car was driven into the river.

They alerted police but it was too late.

They have not released the identities of the dead. It's not known at this time what the woman's motive might have been.

A mother, 44, deliberately crashed her vehicle (shown) into Michigan's Kalamazoo River with two children inside, killing herself and her twin nine-year-old daughters. Police told DailyMail.com that two children who were also related to the woman had been dropped off before the car was driven into the river

Authorities responded to a call of two girls being upset at a Walgreen's drug store at around 10.45pm on Monday.

Upon arriving at the store, authorities worked with the young children who had been let out of the woman's car to determine where to search for the mother and her daughters.

Authorities then responded to the area of Verburg Park off from Paterson Street with a boat.

Authorities responded to a call of two girls being upset at a Walgreen's drug store at around 10.45pm on Monday, and when they arrived, the girls told them about them about the crash. Authorities responded to the area of Verburg Park off from Paterson Street (shown) with a boat and found the vehicle submerged with the mother and one child inside

The boat used to recover the car as the scene of the crash is shown

'Within a few minutes of being in the water, officers located a submerged vehicle. A few minutes later, two victims were located,' the Kalamazoo Department of Public Safety said in a statement on Tuesday.

Police later pulled the third body from the river.

The girls told police they were looking for their uncle, who they found soon after meeting with police.

Authorities said the uncle was not believed to have been involved with the tragedy.

They have not released the identities of the dead or missing. Police are shown at the scene, with the vehicle the mother was driving behind them, showing damage above the front, driver side wheel

The vehicle was recovered with the help of a state police dive team. A diver is shown

The vehicle was recovered with the help of a state police dive team.

Anyone with information is asked to contact Kalamazoo Public Safety at 269-488-8911 or Silent Observer at 269-343-2100 or go to kalamazoosilentobserver.com.

For confidential support in the US, call the National Suicide Prevention Lifeline at 1-800-273-8255 or click here.

For confidential support on suicide matters in the UK, call the Samaritans on 08457 90 90 90, visit a local Samaritans branch or click here.

For confidential support in Australia, please call Lifeline on 13 11 14 or click here.