German Chancellor Angela Merkel was filmed shaking uncontrollably for the second time in just as many weeks, leading to questions about her health.

Earlier this month, Merkel, 64, was caught on camera trembling while standing outside with the Ukrainian president. She blamed the shaking at the time on dehydration, although others speculated that it could be the result of something more serious. This second time Merkel appeared visibly shaking, arms crossed and glancing around the room, as German President Frank-Walter Steinmeier, 63, spoke at a Thursday event.