At least three central security soldiers were injured after unidentified armed people fired mortars on the central security camp in the Khour Maksar district in Yemen's port city of Aden on Friday, the interior ministry reported.
Four mortars landed inside the camp wounding the three members and now deputy interior minister has ordered to investigate the incident and hunt those involved, it said.
In a separate incident in Aden which has been experiencing alarming security disorders, gunmen fired at the police station in the Mansoura district and ran away, the ministry said.
There were no reports of casualties from the second incident.
Clashes have recently erupted between fans of the Southern Movement, Harak, and the security forces in Mansoura amid protests condemning the security deterioration and tight measures in the port city.
The protesters have also called for the government to give priority to the south issue amid preparations for a comprehensive national dialogue.
Harak has been struggling since 2007 to demand a fair solution to the south cause and sometimes it presses for secessionism.
Al-Qaeda has stepped up its operations carrying out several deadly suicide bombings in several Yemeni cities including the capital Sanaa, in what seems to be retaliation after the severe blows in the south.
The army with direct support from the US drove Al-Qaeda militants from their strongholds in Abyan and Shabwa and have killed hundreds of them including senior leaders since May.
In the meantime, the persistent unrest, mainly security disorders, is casting a cloud over the West-backed democratic transition, after the Yemeni parties signed a power-transfer deal following the 2011 turmoil.
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