it comes just days after a palestinian teenager was killed in a stabbing attack against israeli police in the old city. now, the future is uncertain to say the least for thousands of migrants stranded near the polish' belarus border. next we'll speak to an official from the international rescue committee working on aid programs for them. >> plus a new list is outranking the world's most polluted cities. when we come back who tops the list and how the government plans to fix it.