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Farah Abdi Warsameh, Associated Press
In this photo taken Sunday, July 27, 2014, African Union (AU) peacekeepers stand near a cache of weapons recovered from a garage in Mogadishu, Somalia. An official says that Somalia's government has launched a new disarmament campaign, that has netted some 500 guns during four raids, which is being carried out because officials fear that weapons could fall into the hands of al-Qaeda-linked fighters.

MOGADISHU, Somalia — Combat shook Mogadishu early Friday as government troops launched a dawn attack on a house belonging to a former warlord as part of a disarmament campaign. Seven people died in the violence.

Explosions and gunfire were heard as troops battled militiamen loyal to the former warlord.

The African Union military force in Somalia, AMISOM, said the raid was carried out near the home of a former district commissioner, Ahmed Daci. The AU said that Daci's militia fired at AMISOM, precipitating a firefight.

"During the operation, the militia was overpowered and 20 were arrested, 15 guns and an assortment of ammunition recovered," AMISOM said on its Twitter feed.

In bloody scenes that recalled the days of daily warfare in this seaside city, wounded Somalis were carted off the hospitals and onlookers helped carry or push the casualties.

The dead included four civilians, two militia members and one soldier, said police officer Capt. Mohammed Hussein. Eight people were wounded, he said.

Launched last week, the Somali government's disarmament campaign is an attempt to reduce the number of weapons in the violence-prone city. The government says some 500 guns were recovered during the first four operations. Friday's operation was the fifth.

The target of the government's disarmament campaign is the feared and powerful clan warlords. The government says the raids are taking place to ensure that the city's arms don't fall in the hands of al-Shabab militants.

However, some opposition politicians believe that the weapons drive is an attempt to silence or neutralize opponents of the government. A national election is scheduled for 2016 if the security situation permits.

"We are ready to lay down weapons for the pacification of Mogadishu, but this kind of tactic will not work," said Abdullahi Sheikh Hassan, a Somali politician whose home was also raided Friday.

Fatima Ali, a Mogadishu mother of four, said Friday's battle sent everyone in her house to the ground for safety.

"We are very terrified," she said. "We haven't heard something like this for some time."

A proposed disarmament law has been approved by the government's cabinet but hasn't yet been voted on by parliament.