The heavily fortified compound in Somalia’s capital Mogadishu was attacked by al Shabaab militants local media reported.

Mortar shells were fired at the Halane compound, which houses U.N., EU, and African Union facilities, as well as embassies of countries including the U.S. and the U.K.

Bashir Ahmed Ali, a police officer in Mogadishu confirmed the attack but did not provide details on any casualties.

The U.N. Assistance Mission in Somalia (UNSOM) also tweeted a confirmation later, but said the “mortar rounds landed in the vicinity” of the compound.

“Following standard procedures, security personnel are in the process of assessing any potential damage or injuries. We will communicate more details as they become available,” UNSOM said in the tweet.

In a statement online, al Shabaab took responsibility for the attack, claiming it fired five mortar shells at the compound and there were several casualties.

This is the second time Halane compound is attacked by al Shabab