BRUSSELS (AP) — European Union leaders faced stern warnings at Thursday's summit meeting their credibility would suffer if they failed to respect pledges on tackling the refugee emergency. Greece's coast guard was searching for eight people missing after a boat carrying people attempting to reach the eastern Aegean island of Lesbos off Turkey collided with a patrol boat and sank during a rescue operation. German Chancellor Angela Merkel told the German parliament before her Brussels departure that without doubt Turkey plays a key role in this matter. Because with more than 2 million refugees it currently bears the main burden of the flight from Syria.