© AFP/GraphicThe incident happened on Tuesday on the Lokoja-Okene road south of the capital Abuja
Thirteen people were killed when a speeding bus ran over robbery victims forced to lie face down on a main road south of Nigeria's capital, police said Wednesday.

"I can confirm 13 dead. The incident happened on Tuesday on the Lokoja-Okene road. The bus was heading to Abuja when robbers stopped it and ordered the passengers to disembark," police spokesman Yemi Ajayi told AFP.

"As the passengers were ordered to lie face down, (another) bus ran over them at top speed, killing 13 and injuring many others, " he said.

Local media said up to 50 people were killed in the accident.

Ajayi said no arrests were made as the robbers fled the scene before police arrived.

Cases of bus robbery are common on Nigeria's inter-city roads.