At least two people were injured as heavy gunfire broke out near the presidential palace in Guinea’s capital Conakry on Sunday morning, while military vehicles patrolled the streets, witnesses said and videos shared on social media showed.

It was not clear who was exchanging fire.

A senior government official said 83-year-old President Alpha Conde was unharmed but gave no further details.

A military source said the gunfire involved angry members of the special forces, an elite army corps. The source did not say what caused the anger.