ISIS militants blew up major power supply lines in northern Iraq on Tuesday, leaving several areas without electricity amid scorching temperatures.

Three high-voltage lines in the southern part of Kirkuk province were targeted by militants, according to a statement by the Kirkuk Electricity Distribution Company.

ISIS militants placed bombs that were then detonated remotely, the statement said, adding that technical teams were working to restore the power supply in the area.

ISIS militants have ramped up attacks in the region over recent months, especially near the provinces of Kirkuk, Salahuddin, and Diyala.

In 2017, Iraq declared victory over ISIS by reclaiming all territories captured by militants since the summer of 2014, estimated to be about a third of the country’s total area.

The militant group, however, still has sleeper cells in Iraq and continues to launch sporadic attacks on civilians, security forces, infrastructure, and other targets.