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People wait for rescue on the rooftop of a ruined building tangled with tsunami-drifted debris in Rikuzentakada, Iwate Prefecture, Saturday morning, March 12, 2011 after Japan's biggest recorded earthquake slammed into its eastern coast Friday. (AP Photo/Kyodo News)
Rescue teams searched through matchstick rubble Saturday for thousands of people missing in flooded areas of northeastern Japan, beginning one of the most complex relief missions in history. (AP)

Hyper-modern Japan may be peerless at dealing with earthquakes. But potential radiation has created another layer of alarm unseen in other countries recently ravaged by quakes.

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Security forces used water cannons, tear gas and live ammunition to quell anti-government activists in the capital early Saturday, witnesses said, but were forced to retreat after hours-long clashes in which at least two people were reportedly killed and hundreds were injured.

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