Former US President Bill Clinton has tweeted:
One year later, inspired by so many stories of survival and hope. My thoughts are with Boston today. #BostonStrong
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The al-Bakrs were devastated after Israeli airstrikes killed four boys in their family, they are now waiting for news from the boat tragedy.
Zalkalns was jailed in his native Latvia for eight years in 1988 after he admitted killing his wife with a piece of electrical equipment.
The family of a woman who died in a queue of ambulances outside hospital are demanding action so that this doesn't happen again.