A former Yemeni ambassador to the Arab League accused President Ali Abdullah Saleh on Sunday of sending an assassination squad to murder him at his south Cairo home.
"Bikers attacked my house with grenades and fire bottles at 3 am early Sunday," Malik Mansour told Egyptian daily Al-Masry Al-Youm.
Mansour accused Saleh and his loyalists of plotting his assassination to avenge his vocal support for the uprising.
On 22 March, Mansour announced his support for the Yemen uprising and demanded the removal of Saleh, who has been in power since 1979.
In April, Saleh replaced Mansour with Mohamed al-Haisamy as Yemen's Arab League representative.
Egypt's Interior Ministry said in a statement that the attackers burned a balcony and a small room before fleeing on their motorbikes, but refused to comment on potential motives for the attack.
Security officials in Giza have formed a task force to identify and arrest the men based on a description given by a janitor working in Mansour's building, the statement added.
Security experts say a task-force would by highly unlikely unless terrorism or political violence was suspected, however.
In August, Maareb Press, a Yemeni opposition website, claimed members of Yemen’s security services had arrived in Cairo to kill certain Egypt-based opposition figures.
Meanwhile, Saleh returned Friday to Yemen amid a sharp escalation in violence that has raised concern the country may spiral into all-out civil war.