About 14,000 have been rescued since Monday amid calm seas, and there have been at least three confirmed instances of boats sinking. But the number of dead can only be estimated based on survivor testimony, which is still being collected.
"We will never know exact numbers," Medecins San Frontieres said in a Tweet after estimating that 900 had died during the week. The United Nations High Commissioner for Refugees (UNHCR) said more than 700 had drowned.