Three people have been killed in eastern Ukraine after the bus they were riding in struck a land mine.

Officials said the bus was traveling from Artemivsk, a town controlled by government troops, to Horlivka, in a separatist-held area northeast of the city of Donetsk.

According to reports, the bus struck the mine when the driver tried to go around a checkpoint.

The wounded, numbering at least seven, were taken to a hospital in Artemivsk.

Elsewhere, President Petro Poroshenko was on hand at Kyiv's international airport to oversee a shipment of U.S. military aid to Ukraine, including 10 Humvee vehicles.

In total, Washington plans to send 200 regular Humvees, radios, countermortar radars, and other nonlethal equipment worth $75 million.

U.S. President Barack Obama has so far refused to heed calls from Congress to send defensive arms and ammunition to Ukraine.

Based on reporting by AP and dpa