A dispute between neighbors Greece and Bulgaria over ongoing protests by Greek farmers has caused highway tailbacks of up to 30 kilometers (18.5 miles) at the border.

All six crossing points along the 472-kilometer (265-mile) border were closed Friday amid ongoing highway blockades by Greek farmers and counter-protests being staged by Bulgarian truck drivers on the other side of the frontier.

Motorists and trucks traveling between the two countries were forced to make a lengthy detour westward, through Macedonia.

Greek farmers have been blocking roads for nearly a month to protest planned pension reforms, angering Bulgarian truck drivers who have staged counter-protests in an attempt to pressure their government into action.

On Friday, Bulgaria's parliament approved a resolution seeking EU intervention to end the Greek blockades.