(CNN)This holiday week erupted in an extraordinarily violent start, with high-profile attacks in four cities on Sunday and Monday.
At least 75 people were killed in the incidents, which are not connected.
ADEN, YEMEN
What happened: At least 52 soldiers were killed and 34 were injured in a suicide bombing on Sunday in the Southern Yemeni city of Aden. Who: ISIS claimed responsibility. Also: At least 48 soldiers were killed on December 10 at the same camp. The attackers targeted soldiers who were lining up for pay, according to news agency Saba. ISIS claimed responsibility for that attack as well.
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BERLIN, GERMANY
Read more: http://www.cnn.com/2016/12/20/world/2-days-of-high-profile-attacksin-4-cities/index.html
2 days, 4 cities, dozens dead in high-profile attacks
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