In Maryland, a balloon from the JLENS missile-detecting system (earlier story [soylentnews.org]) broke loose from its tether. The balloon eventually descended to the ground, but its dragging cable caused an electrical outage affecting 30,000 or 35,000 people. The Secretary of Defense promised to catch the balloon and fly it again.
coverage:
The Energy Education Council offers safety tips [safeelectricity.org] for helium balloons.