A special education teacher and married mother accused of having sex with her 18-year-old student may have slept with at least three other pupils, police in the US state of Connecticut allege.

Laura Ramos, 31, who has a young child, is standing trial accused of sexual assault but faces new charges after another student reportedly confessed to police the pair had slept together.

Police say a second student in the special education unit told them he had sex with her and investigators are now looking for other alleged victims.

Ms Ramos, from New Haven, Connecticut, turned herself in to police on Wednesday after the second student came forward.

Reports said police believed Ms Ramos had sex with at least four students, although she has only been formally charged in connection with two.

Ms Ramos resigned from Central High School in Bridgeport after the first sexual assault charges were brought against her.

Police claim she acknowledged several sexual encounters took place in her car with the first student between December and April.

According to the Connecticut Post, citing a police statement, the student claimed in April he had sex with Ms Ramos in her car after first having dinner at a local restaurant.

The paper reported police as saying that on another occasion in April, Ms Ramos had complained to the student that her husband didn’t want to have sex with her before they had sex in the “electrical room” of a restaurant.

She has pleaded not guilty in that case and has been released on bail.

After her second arrest, Ms Ramos’ lawyer, Edward Gavin, said: “My client voluntarily surrendered to police and we are awaiting the paperwork indicating the basis for the new charge.

“Laura Ramos continues to maintain her innocence and we look forward to the progression of the case.”

Judge William Holden has barred Ms Ramos from contacting her alleged victims.

Ms Ramos’ husband reportedly accompanied her to her first court appearance but was said to have appeared alone as she was given the new charges.