Explosions were heard in central Kyiv on June 16 as an African delegation visited Ukraine on a peace mission, witnesses and Kyiv's mayor reported.
Mayor Vitali Klitschko reported explosions in the central Podil district and warned that more missiles were headed toward the capital.
A Reuters correspondent in Kyiv saw the smoke trail of two missiles in the air. It was not clear if those missiles were fired by Russia or by Ukrainian air defenses.
The African leaders are visiting Ukraine in a self-professed bid to broker peace between Kyiv and Moscow, despite three presidents dropping out and Ukraine's counteroffensive overshadowing the mission.
Four presidents and three representatives are due to hold talks with Ukrainian President Volodymyr Zelenskiy in Kyiv before heading to Saint Petersburg on June 17 to meet his Russian counterpart, Vladimir Putin.
"It is at times of escalated conflict that a search for peace must be equally accelerated," South African President Cyril Ramaphosa said in a statement.
