Residents of Hasakah in northeastern Syria endured a fifth night of gunfire and explosions as fighting between the U.S.-backed Syrian Democratic Forces and fighters with the Islamic State terror group there raged into a sixth day.

Video from activists on the ground near the al-Sinaa prison and shared with VOA showed repeated flashes and explosions while the constant drumbeat of gunfire could be heard echoing in the background.

VOA could not independently confirm the authenticity of the video but other accounts on social media from activists and residents including the British-based Syrian Observatory for Human Rights said fighting continued unabated as SDF troops tried to retake control of the entire prison and root out IS fighters still holed up in surrounding neighborhoods.

Multiple U.S. officials Monday told to VOA that the U.S. and coalition increased their support the SDF to help retake the prison and were now sending in armored vehicles strategically positioned to assist with security in addition to providing real-time aerial intelligence and precision airstrikes.

Theres been some limited ground support Pentagon press secretary John Kirby said later during a briefing in response to a question from VOA. For instance putting Bradley fighting vehicles across access points to help block as obstacles.

An SDF spokesperson also urged holdouts to give up sharing a final call for safe surrender on social media.

We know that you have internet connection and see your setbacks an English version of the warning said. You are completely surrounded by our forces and there is no way out.

Surrender yourselves. Do not chose the final dance of death it added.

In all SDF officials have said about 10000 troops have been brought in to quell the prison break which began late Thursday when IS sleeper cells converged on the prison and detonated at least one car bomb.