Story Highlights• U.S. troops kill two insurgents in clashes around Baghdad mosque
• Powerful Shiite leader's son is unharmed after convoy ambush in Baghdad
• Video posted on Web site says insurgent "cabinet" formed
• U.S. solder killed in a rocket attack on a U.S. base
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BAGHDAD, Iraq (CNN) -- Two insurgents were killed in a firefight Friday with U.S. troops in Baghdad after militants fired on the soldiers from a mosque, the U.S. military said.
The incident took place in southwestern Baghdad, and the gunshots came from the Husayniayh al-Bayaa mosque. The troops were from the 4th Brigade Combat Team, 1st Infantry Division.
Attack helicopters fired about 100 rounds of 30 mm ammunition during the firefight, the U.S. military said.
After the firefight, more soldiers arrived and secured the scene.
Soldiers went through nearby buildings and "found chemicals in a house believed to be bomb-making materials," the military said.
A suspect was detained. U.S. troops didn't enter the mosque, but Iraqi troops did.
Convoy of Shiite leader's son attacked
Six security guards were wounded Thursday night when gunmen ambushed the convoy of a top Shiite leader's son, said Haytham al-Hussaini, a spokesman for the office of Abdul Aziz al-Hakim, the head of the Supreme Council for the Islamic Revolution in Iraq, or SCIRI.
Al-Hussaini said Ammar al-Hakim was unharmed after his convoy was struck in southern Baghdad's Dora neighborhood.
The leader's son was headed to Baghdad from Najaf when his convoy came under attack. Al-Hussaini said the guards engaged "these criminal gangs" before driving out of the area.
SCIRI, one of the most powerful political parties in Iraq, is part of the Shiite-led ruling coalition called the United Iraqi Alliance.
The younger Al-Hakim's detention by U.S. troops sparked mass protests in February.
Video says insurgent 'cabinet' formed
The insurgent umbrella group that recently claimed responsibility for the execution of 20 security officers and the bombing of the Iraqi parliament complex says it has chosen a "cabinet."
A video allegedly from the Islamic State of Iraq, posted on an Islamist Web site, listed the names of 10 people.
One name stood out: The successor to the leader of al Qaeda in Iraq, listed as the "war minister."
Sheikh Abu Hamza al-Muhajer, also known as Abu Ayyub al-Masri, succeeded Abu Musab al-Zarqawi, killed in Iraq's Diyala province last year by a U.S. airstrike.
CNN cannot determine the authenticity of the video.
CNN's Jomana Karadsheh contributed to this report