CONCORD, N.H. (AP) – New Hampshire’s state computer system was breached and might have compromised customers’ credit card numbers, Gov. John Lynch said Wednesday.

The breach affected online and in-person transactions at motor vehicle offices, Veterans Home in Tilton, Liquor Commission and state liquor stores.

“We felt it was important to alert the public that there is at least the possibility that some credit card information may have been accessed,” Lynch said at a news conference.

No reports of illegal activity have been reported, but officials asked people who used credit cards in the last six months to report suspicious purchase to the state consumer protection bureau at 1-888-468-4454.

State technology experts became aware of the breach Wednesday when they spotted a variation of legitimate “Cain and Abel” software in the system.

The illegal software, which may have been installed for six months, allows a hacker to watch transactions in real time, but not to recover earlier records, said Richard Bailey, N.H. chief information officer.

He said Social Security numbers were not likely at risk because they don’t appear on credit cards.

Bailey said it was not known when the illegal software was installed.

“We know it was not there six months ago,” the last time the system was inspected thoroughly, Bailey said.

Attorney General Kelly Ayotte said the FBI has been asked to help with a forensic examination of the breached system.

“We take this intrusion into the state system very seriously,” Ayotte said.

Bailey said the state is installing a software program that will pick up potential intrusions automatically.