A four year old girl beheaded

               The girl's bicycle can be seen laying on the ground as authorities investigate the scene of the attack.
A four-year-old girl was beheaded in Taiwan in what appears to have been a random knife attack, state media said. 

On Monday morning, a 33-year-old man attacked the girl with a cleaver in full view of her mother as they were on their way to a metro station in Taipei, the island's capital, 

The mother of the slain child said her daughter had been riding her bike about a meter away from her when it became stuck. 

She saw the man approaching and at first thought he was going to help her daughter but he drew his knife and decapitated her.

"I saw the suspect slashing my daughter with a cleaver. I immediately grabbed him but I could not pull him away," she said.

Passer by heard her screams for help and rushed to restrain the attacker until police arrived. 

An initial investigation found that the suspect, identified only by his surname Wang, waited near the metro station after allegedly purchasing the knife at a supermarket earlier that day.

Citing police, CNA said the man had a history of mental illness and had received treatment at a psychiatric hospital. 

The suspect was detained at a police station, where a large angry crowd gathered. Officers attempted to escort him out of the building, still with blood splashed across his face, but several people rushed the suspect, eventually forcing police to take him back inside.