A grenade explosion has killed at least two people during Madagascar's national day celebrations in the capital Antananarivo, officials say.  About 80 people were wounded in the blast at a stadium, general Anthony Rakotoarison told AFP news agency.

President Hery Rajaonarimampianina said it was a "terrorist act", and blamed it on "political divergences".  The situation remains fragile in the country, with supporters and opponents of the president at loggerheads.

The blast happened during a free concert at the Mahamasina stadium. A military parade had been held there earlier.  It was not immediately clear who or what was behind the explosion.

In a statement broadcast on national television, the president said: "Divergences in point of view may exist between us... [But] if the leader does not suit you... you cannot kill the population," he said.

"We will never tolerate destabilisation. Especially because this is not only destabilisation but an act of terrorism."

Read more:  BBC News