NASA indefinitely delayed a four-person crew's mission to the International Space Station on Thursday over an escalating probe into air leaks aboard the orbiting laboratory's Russian segment. The U.S.

NASA wants to evaluate recent efforts to stop a small but persistent air leak in the Russian segment of the space station.

A chartered spaceflight for India, Poland and Hungary's first astronauts in decades has been delayed indefinitely because of leak concerns at the International Space Station.