"Terrorists fired on a passing vehicle of an NGO at morning rush hour in Police District 1 of Jalalabad. All people aboard the vehicle were affected in the incident but no passerby was hurt during the gun firing," spokesman Attahullah Khogyani told Xinhua.
Khogyani said an investigation is underway and "details about the incident will be shared with media as appropriate."
A security source said the targeted vehicle belongs to Peace Medical Service (PMS), an NGO carrying out agriculture and irrigation projects in Nangarhar, 120 km east of the country's capital, Kabul.
The source added that "the wounded NGO worker is the general director of PMS office."
Over the past months, big Afghan cities have witnessed a spate of terror attacks by the Taliban insurgents and Daesh (ISIL or ISIS) terrorists.
On Tuesday, two national intelligence agency officials were killed and three others wounded after gunmen fired on a vehicle carrying victims to their office in an eastern neighborhood of Kabul.