Unnamed woman has been taken to hospital for a medical evaluation

Officials believe mother and son may been at Maryland park all night

The three-year-old boy 'did not have any signs of trauma on his body'

When they arrived at scene, they found 24-year-old pushing dead son

A woman has been found at a park pushing her dead three-year-old son in a swing, police have said.

The 24-year-old, who has not yet been identified, was reportedly spotted pushing her deceased toddler on the piece of equipment at Wills Memorial Park in La Plata, Maryland, on Friday morning.

Police believe she may have been at the playground with her son all night. The child did not have any signs of trauma on his body. officials said. He has been taken to a medical examiner for an autopsy.

Tragic: A 24-year-old woman, who has not yet been identified, was spotted pushing her dead three-year-old son in a swing at Wills Memorial Park (pictured) in La Plata, Maryland, on Friday morning, police have said

In a news release on Friday, Charles County Sheriff's Office said police had arrived at the park after receiving a report of a woman pushing a young child in a swing for an unusually long stretch of time.

When they turned up at the scene at around 6.55am, they found the woman pushing her son back and forth on the play equipment. They immediately realized the boy was dead, according to WUSA 9.

In the release, the Sheriff's Office said the mother and son are thought to have been at the park at 500 St Mary's Avenue in La Plata, around 30 miles southeast of Washington D.C., since the day before.

The mother has now been taken to hospital for a medical evaluation, police told MyFoxDC.com.

Diane Richardson, a spokeswoman with the Sheriff's Office, said authorities are trying to trace the woman's movements over the past several days in a bid 'to find out what led to this moment'.

Scene: In a news release on Friday, Charles County Sheriff's Office said police had arrived at the park (above) after receiving a report of a woman pushing a young child in a swing for an unusually long stretch of time

There all night? The Sheriff's Office said the mother and son are thought to have been at the park (pictured) at 500 St Mary's Avenue in La Plata, around 30 miles southeast of Washington D.C., since the day before

She added that while were no obvious signs of foul play, it has not been ruled out. The little boy's son's autopsy will be carried out by the Office of Chief Medical Examiner in Baltimore.

'It's a very sad and tragic situation for the mother, her family, the officers,' Ms Richardson told the Associated Press on Friday evening. 'All of us want answers. We're working very hard on that.'

An investigation has been launched.