North Korea has banned foreigners from participating in the Pyongyang Marathon, slated for April, due to ongoing quarantine measures to prevent the spread of the Ebola virus, a North Korea tour agency said Monday.

“No foreigners – professional or amateur – will be able to attend,” Young Pioneer Tours managing director Troy Collings told NK News. He wasn’t told the reason other than it is related to the North Korea’s Ebola measures, he said.

“It’s likely there may still be a marathon held in Pyongyang but no international runners will be allowed to compete,” Collings said.

The ban is