GENEVA, Dhu-AlQa'dah 03, 1436, August 18, 2015, SPA -- Greece must show "much more leadership" to tackle an escalating crisis in which 160,000 refugees and migrants have reached its shores so far this year, the United Nations said on Tuesday, according to Reuters. "The pace of arrivals have been steadily increasing in recent weeks. More refugees and migrants arrived in Greece during the month of July - 50,242 - than during the whole of last year," William Spindler of the U.N. High Commissioner for Refugees (UNHCR) told a Geneva news briefing. "If the (Greek) central authority would come up with leadership and vision and appoint somebody who would coordinate this response, then we and other international organisations would be ready to come and help," Spindler said. "But it's difficult for us to come and start working on the ground if we don't have somebody in charge." Nearly 250,000 migrants have reached Europe by sea so far this year, and at least 2,349 have died making the journey, the International Organisation for Migration (IOM) says. --SPA 14:39 LOCAL TIME 11:39 GMT www.spa.gov.sa/w