KARBALA, Iraq, December 27 (IslamOnline.net & News Agencies) - Six of the U.S.-led occupation forces and seven Iraqis were killed Saturday, December 28, in a series of coordinated attacks in Karbala, while U.S. forces gunned down four Iraqis in the northern city of Mosul.

Four Bulgarian soldiers died in the series of car bomb and mortar attacks in the holy Shiite Iraqi city of Karbala, Bulgarian Deputy Defense Minister Ilko Dimitrov told a news conference in Sofia, reported Agence France-Presse (AFP).

In Warsaw, a Polish military spokesman said two Thai soldiers had also died in the attacks.

Seven Iraqis also lost their lives in the coordinated attacks, in which four car bombs exploded, and mortars and machine-gun fire were used, Adam Stasinski told AFP.

Attacks targeted Karbala's city hall and two Bulgarian and Polish military bases.

"At about 1:00 pm (1000 GMT) today there were multiple attacks on coalition forces around Karbala," said Major Dezso Kiss, attached to the Polish-led division, responsible for the city.

"These attacks included four suicide car bombs, mortars and machine-gun fire," he told AFP, adding that some 25 soldiers were wounded.

An Iraqi doctor, Ali al-Ardawi, said seven Iraqis were killed, including a student and Police Major Sejjad al-Sharifi, while another 102 people were wounded.

Among the injured were four members of the Facilities Protection Service, a security force trained by the Americans, and 20 students at Karbala's university, Ardawi said.

The university on the edge of town hosts the main military base for the Karbala area, according to AFP.

Karbala Governor Akram al-Yasseri, who was slightly wounded, told AFP a bomber exploded a tanker outside the Bulgarian military base after an exchange of fire.

"It was a suicide attack in the course of which the driver was killed," he said.

"The driver had fled his car ahead of the explosion but was still killed by the blast," the governor said.

The final attack was on the Polish military base just outside the city on the road north to Hilla, Yasseri said.

Ambulance sirens wailed in the streets moments after the blasts and rip of machine-gun fire echoed around Karbala.

An AFP correspondent saw three cars completely burnt in front of the governor's office, while U.S. soldiers and a tank were stationed outside the building.

Iraqi police and U.S. troops examine a car in which 4 Iraqis were killed in Mosul

In another development, U.S. occupation troops killed four Iraqis in Mosul Saturday claiming they came under rocket and small arms fire of Iraqi resistance.

Soldiers of the U.S. 101st Airborne Division, which controls a large part of northern Iraq, said they were checking for improvised explosive devices when they came under rocket-propelled grenade (RPG) attack.

The troops fired back, destroying a car and killing its four occupants, Staff Sergeant Eldon Noble said Saturday.

Meanwhile, five U.S. soldiers were wounded when their patrols hit two roadside improvised explosive devices (IED) in the Rusafa district of Baghdad east of the Tigris River, according to a spokesman from the U.S. 1st Armored Division, which commands the capital.

He said first IED struck the patrol at 7:25 am and that as "a quick reaction force was on the way" to the site of the incident, it too was hit with another explosion.