BEIRUT, Lebanon — The Syrian government said Friday that an oil pipeline had been hit by a bomb in what the authorities called a terrorist attack, as the country’s uprising continued with the Friday protests that have become a ritual there. Security forces killed nine people at the demonstrations, protesters and activists said.

Security forces also killed at least seven people in overnight raids in towns near the Iraqi border, activists said. Government forces had stayed out of the towns for weeks, fearing that an assault would ignite tribal tensions.

The attack on the pipeline could cause new troubles for Syria’s economy. Oil revenue has become increasingly important as tourism as fallen off during months of upheaval.

A report on Syrian television said that the pipeline was near the town of Tal Kalakh as well as the Tal Hosh dam. The explosion left a 33-foot-deep crater.