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Around 185 people have been killed and more than 1,800 injured in three days of fighting in Sudan, according to the UN. The city has seen air strikes, shelling and heavy small-arms fire.
Both the army and a paramilitary group called the Rapid Support Forces (RSF) claim to control key sites in Khartoum, where residents have been sheltering from explosions.
Mr O’Hara was not “seriously hurt”, Irish Foreign Minister Micheál Martin confirmed.
He described the attack as a “gross violation of obligations to protect diplomats”.
Mr Martin described the ambassador as an “outstanding Irish and European diplomat who is serving the EU under the most difficult circumstances”.