Syria TV, a 24-hour rolling news channel, flickered on and off and then issued a news flash, before going totally dark, saying that signals were being interrupted. Its broadcasting was then switched to the frequency of another state-run channel, Syrian Drama TV.
State news agency SANA said the state channels had been hit by signal jamming.
It said Syrian channels were frequently disrupted by the "countries of conspiracy" aimed at stopping truthful news reaching viewers worldwide.
It did not specify which country it believed was to blame.The government of President Bashar Assad, which has been fighting insurgents for the last four years, is opposed by Western and Gulf Arab countries.