Baghdad, Iraq (CNN) -- Gunmen clad in Iraqi army uniforms stormed a house Wednesday north of Baghdad and killed six members of a family, an Iraqi Interior Ministry official said.
The attackers slit the throats of two women and a 13-year-old girl and shot dead three men at the home in the predominantly Sunni Arab town of Tarmiya, once a stronghold of al Qaeda in Iraq and a battleground at the height of the sectarian violence in Iraq.
The attack prompted comparisons with a recent assault near Abu Ghraib, a Sunni Arab town on Baghdad's western outskirts. People dressed in army uniforms killed 13 men from two villages and dumped them in a cemetery.
It is not known in either case whether the attackers were soldiers or were masquerading as Iraqi service members.
In other violence Wedneday, a bomb killed at least four people and wounded 25 others in Karbala, an Interior Ministry official said.
The bomb detonated in a popular restaurant packed with breakfast diners.
The restaurant is near the headquarters of the city's security forces, said Karbala police spokesman Abdul Rahman al-Meshawi.
The attack came as Iraq prepares for the Muslim feast of Eid al-Adha, which begins Friday. Authorities have beefed up security measures for the five-day holiday, which in the past has been a prime time for insurgents to carry out high-profile attacks.
Karbala, about 60 miles southwest of Baghdad, is revered as the home to a shrine honoring Imam Hussein, the grandson of the Prophet Mohammed and a venerated Shiite martyr.