A Quebec woman remains in an induced coma after suffering third-degree burns following a corrosive acid attack.

Police in Longueuil are investigating after finding 29-year-old Tanya St-Arnauld in a neighbour’s bathroom screaming in pain following an alleged acid attack early Sunday morning.

St-Arnauld lost all her hair and sustained burns to her chest and eyes, said police. She was taken to a Montrael hospital, where she remains.

Police allege the victim had a bucket of acid thrown at her following an argument with her boyfriend.

St-Arnauld’s boyfriend had been using the acid to clean the concrete surrounding their Ste-Catherine Street home, said police.

The couple’s neighbour told CTV Montreal he heard the pair argue and then called the authorities.

Neighbour Pierre Jutras said that he heard shouting late at night, “as I’ve heard before.”

And then … it came a little harder and then I called 911.”

Jutras said this isn’t the first time the couple fought.

“We live here and many nights they were on their own balcony and talking loud until late at night,” he said.

Police arrested 27-year-old Nikolas Stefanatos on Sunday.

Stefanatos was charged Monday with aggravated assault and assault causing bodily harm.

The suspect is scheduled to appear in court on Friday, when he will seek bail.

With a report from CTV Montreal’s Stephane Giroux