Kosovo worked to shore up water and power supplies on Saturday and stepped up security at strategic sites after an explosion hit a canal that sends water to its two main power plants, an incident Pristina labeled a “terrorist act” by neighboring Serbia.

Kosovo police have detained eight people suspected of being part of the attack, according to Interior Minister Xhelal Svecla. A big cache of weaponry, ammunition, military and police uniforms, cash and other items were confiscated at 10 locations in the north.

Kosovo and Serbia continued to sling allegations at each other on Sunday, just days after an explosion targeting a strategic canal in Kosovo sent tensions soaring between the long-time rivals.