i'm jamie colby. could this be a major break in the search for flight 370? china's state run media saying one of its ships detected a pulse signal in the southern indian ocean. the vessel dragging a ping locator trying to find the plane's black box. ships, planes, even a british nuclear submarine are in the waters trying to confirm the signal is from that plane. over in afghanistan, the polls closing in the latest preside s presidential election. voters waited in line to cast their ballots despite threats from the taliban. hamid karzai leaves office without signing a u.s./afghan security pact. keep it here for all the coverage on the missing plane. see you back at 1:00 p.m. eastern.