BAGHDAD, Iraq (AP) – With car bombs, assassinations and raids on police stations, insurgents killed at least 25 people, including Iraqi policemen and a deputy governor, across the volatile Sunni Triangle on Tuesday, and a militant group claimed it executed eight Iraqi employees of an American security company.

The string of attacks – including one in which 12 policemen’s throats were slit in their station – were the latest by the insurgency targeting Iraqis working with the American military or the U.S.-backed government ahead of the Jan. 30 national elections.

Brig. Gen. Jeffery Hammond, assistant brigade commander in the 1st Cavalry Division that controls Baghdad, said attacks by insurgents are expected to escalate further in the run-up to the ballot.

“We anticipate that the enemy will (continue with) attacks, intimidation, assassinations and other messages designed to destroy life in Baghdad,” Hammond said, adding that Iraqi security forces will bear the brunt of providing security for the elections and that U.S. troops will back them up only if needed.

Iraqi leaders said the guerrillas – who are mostly Sunni Muslims and have been blamed for attacks against Iraq’s Shiites – are bent on triggering ethnic strife before next month’s poll.

“The terrorists intend to destroy Iraq’s national unity,” a statement issued by the Interim National Assembly said. “Their intentions are to harm this country which faces crucial challenges amid a very difficult period.”

Shiite Muslims, who make up around 60 percent of Iraq’s people, have been strong supporters of the elections, which they expect to reverse the longtime domination of Iraq’s Sunni minority. The insurgency is believed to draw most of its support from Sunnis, who provided much of Saddam Hussein’s former Baath Party membership.

Near Saddam’s hometown of Tikrit, gunmen attacked a police station, overwhelmed 12 Iraqi policemen there, slit their throats and then blew up the building, said Lt. Col. Saad Hmoud, a local police official.

The deputy governor of the restive Anbar province, Moayyad Hardan al-Issawi, was assassinated near Ramadi, east of Baghdad, police official Abdel Qader al-Kubeisy said.

Gunmen who shot him left a statement next to his body: “This is the fate of everyone who deals with the American troops.” The statement was signed by the group Mujahedeen al-Anbar, or “holy warriors of Anbar.”

Such flagrant attacks appear designed to cause panic among Iraqi officials and security forces and to provoke a sectarian conflict between Shiites and Sunnis.

In other strikes Tuesday, a car bomb killed five Iraqi National Guardsmen and injured 26 near Baqouba, a town 35 miles northeast of Baghdad, after the paramilitary troops cordoned off an area in order to disarm a roadside bomb, said U.S. Maj. Neal O’Brien.

In Baqouba itself, unidentified gunmen assassinated Capt. Na’em Muhanad Abdullah, a local police commander, and wounded three other men, a spokesman said.

Elsewhere Tuesday, a car bomb exploded in the village of Muradiya, about 20 miles northeast of Baghdad, killing five civilians and wounding dozens, said Ahmed Fouad, a doctor in the Baqouba General Hospital.