More than 700 migrants are feared dead in Mediterranean shipwrecks over a three-day span last week. The shipwrecks may represent the largest loss of life reported in the Mediterranean since April 2015, when a single sinking took the lives of an estimated 800 people. The largest tragedy in the past week occurred on Thursday, when a wooden boat carrying between 400 and 550 people sank as it traveled from Libya to Italy. Warmer waters and calmer weather of late have increased crossing attempts, and humanitarian aid groups fear the situation could worsen.