An explosion near the home of Yemeni President Abd Rabbu Mansour Hadi in Khourmaksar, Aden, has caused no casualties.

But Yemen remains on high alert over threats from al-Qaeda.

The armed group has lost ground to the government in the last few days, raising fears of revenge attacks in the capital Sanaa.

Al Jazeera's Hashem Ahelbarra reports from Sanaa.