(CNN) -- A massive emergency response operation is under way in northern Japan, with world governments and international aid groups coming together to bring relief to the beleaguered island nation. According to Japan's Foreign Affairs Ministry, 91 countries and regions and 6 international organizations have extended offers of assistance. The Japanese government has received 11 urban search and rescue teams, the group said in a situation report, including teams from the United States, South Korea, Australia, Germany, Mexico, New Zealand, China, Hungary, Singapore and the United Kingdom. Japan's own search and rescue team was in New Zealand, assisting with recovery from the recent Christchurch earthquake, when the quake and tsunami struck Japan on Friday.
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NEW: Mexican rescue squad arrives in Sendai
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U.S. search and rescue teams are in hard-hit Ofunato
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New Zealand sends search and rescue team as it recovers from its own earthquake
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China sends team despite long-running tensions with Japan
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