Nasa is reported to be investigating a claim that an astronaut accessed the bank account of her estranged spouse from the International Space Station, in what may be the first allegation of a crime committed in space.

Axar.az reports citing BBC.

Anne McClain acknowledges accessing the account from the ISS but denies any wrongdoing.

Her estranged spouse, Summer Worden, reportedly filed a complaint with the Federal Trade Commission.

Ms McClain has since returned to Earth.

The astronaut told the New York Times through a lawyer that she was merely making sure that the family's finances were in order and there was enough money to pay bills and care for Ms Worden's son - who they had been raising together prior to the split.

"She strenuously denies that she did anything improper," said her lawyer, Rusty Hardin, adding that Ms McClain was "totally co-operating".