article_snippet.sent: The conflict is exacting a heavy toll on children and families, UNICEF said in a statement.
article_snippet.sent: Last year, 246 lives were reported lost in sea crossings to Yemen.
article_snippet.sent: One family told CNN the dangerous crossing was "a window into hell.
article_snippet.sent: " And underscoring the increasing toll being exacted by the conflict in Yemen, the World Health Organization said Friday that at least 643 people have been killed in Yemen since the fighting escalated three weeks ago.
article_snippet.sent: As of 6 April 2015 there have been a total of 643 deaths and 2,226 injuries," the WHO, the health arm of the United Nations, said in a statement.
article_snippet.sent: Since then, Saudi Arabia has launched airstrikes meant to halt the advance of the Houthis.
article_snippet.sent: In at least one case, according to Houthi sources, one of those strikes hit a school.
highlights_snippet.sent: WHO: At least 643 people have been killed, more than 2,000 injured in three weeks .
  