A woman can be heard shouting 'I'm pregnant' before being shot by police.

A video of the altercation between the woman - said to have been unarmed - and police in Baytown, Texas is being widely shared online.

The woman has not been identified at this stage but an investigation into the shooting is underway, according to US reports.

In the video, the woman can be heard saying that she is pregnant moments before being shot.

Police say she had managed to arm herself with the officer's Taser before being shot.

(Image: trapkunklees5/Twitter)

Baytown Police Department have released few details about the incident - thought to have happened last night - and have not confirmed if the woman was actually pregnant.

According to KHOU-TV, the woman was shot and killed by the officer.

Brett Buffington reported that homicide investigators were at the scene at the apartment complex where the shooting occurred early today.

"It was a sad situation. Tragic. The lady... she did live here. We would often see her, see her walk her dog around," said resident Raquelle Cuellar.

Baytown Police Department reportedly wrote on Facebook: "Baytown Detectives are on the scene of an Officer involved shooting in the 1600block of Garth Road.

"It is very early in the investigation however what detectives have learned thus far is on of our officers, an 11 year veteran with the department, was patrolling an apartment complex in the 1600 block of Garth Road when he came across a 45-year-old female that he knew from previous encounters and knew she had outstanding warrants.

(Image: trapkunklees5/Twitter)

"The officer contacted the female and attempted to arrest her at which time a struggle ensued, forcing the officer to deploy his department issued Taser at the female .

"It appears that as the officer was then attempting to handcuff the female she was able to gain control of his Taster and turned it on th officer, Tasing the officer, which forced the officer to draw his duty weapon and fire multiple rounds at the female, striking her at least once.

"The female has been pronounced deceased at the scene."

The post is no longer available with the Facebook page believed to have been taken down.

In the video, posted to Facebook and Twitter by multiple users, the woman can be heard telling the officer she is walking to her house.

The officer who shot the woman appears to be the only officer at the scene during the incident.

The woman can be seen walking as she tells the officer he is “harassing” her.

(Image: trapkunklees5/Twitter)

The pop of a stun gun can be heard as the officer appears to fire his Taser at the woman. It is not clear if the stun gun hit the woman.

The woman can then be seen on the ground with the officer on top of her, trying to grab her hands.

The woman yells, “I’m pregnant,” and the officer steps away from her as she appears to be moving her hands near his legs.

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As the woman sits up, the officer fires his gun five times and the woman falls back to the ground.

It is not clear how many times she was shot.