Two members of state Sen. Wendy Davis' staff were in the office when the attack occurred about 4 p.m., WFAA-TV, Dallas/Fort Worth, reported. One of the employees jumped over flames to get to a fire extinguisher in another room, the TV station said.
No injuries were reported. Davis was away her Senate office at her law office at the time of the attack.
Davis, a Democrat, played a high-profile role last week in arguing against plans by Texas state officials to cut funding for Planned Parenthood, saying such a move could deprive 130,000 Texas women of healthcare services including cancer screening and contraception, WFAA-TV said.