A Palestinian suicide bomber blew himself up in a crowded train station in central Israel today, injuring 13 and killing a security guard. Palestinian leader Yasser Arafat and Palestinian Prime Minister Abu Mazen ended their standoff yesterday when Arafat agreed to put Mohammed Dahlan in charge of security. Arafat was under heavy pressure from the U.S. to give Abu Mazen a free hand to choose his Cabinet. Both the prime minister and his choice for security chief are supported by the U.S., Britain and Israel. The U.S. government promised to help implement its so-called roadmap to peace only once the new prime minister was installed.