Los Angeles  - Authorities are investigating two police chiefs suspected of breaking into the home of the surrogate mother carrying Sex and the City star Sarah Jessica Parker's twin babies, according to US reports Thursday.

Ohio news station WTRF TV reported that Martins Ferry Police Chief Barry Carpenter and Bridgeport Police Department Chief Chad DoJack struck an agreement with a reporter to burgle the unidentified woman's house and gather information on her lifestyle for a magazine expose by The National Enquirer.

Celebrity website TMZ. com reported that the Ohio Bureau of Criminal Investigations has seized computers used to hatch the plot as evidence after police were called to the pregnant woman's house in Martins Ferry following the recent burglary.

Carpenter dismissed the accusations, telling reporters "I'm 100 per cent innocent in this and my department is as well."

The burglars were reportedly seeking voicemail recordings left for the woman by Parker and her husband, Matthew Broderick. The stars are expecting twins via the surrogate mother this summer, after being unable to naturally conceive a brother or sister for 6-year-old son James Wilkie.

The Hollywood couple expressed outrage over the incident.

"The most unsavory of things have been done," Parker said, according to the New York Post. "She's had her phone hacked, her personal computer information hacked, she's had threats against her and true harassment. ... There's simply no excuse for doing this to somebody. It's not acceptable. I am incredibly outraged by the sort of extraordinary and unprecedented invasion of her privacy." (dpa)