WASHINGTON, D.C. — NASA admitted on Wednesday there was "tension" during meetings with Boeing executives about how to bring home two astronauts stranded on the International Space Station, but denied reports of shouting matches.

The US space agency is enlisting SpaceX to rescue the astronauts because of safety concerns with Boeing's Starliner capsule, which encountered thruster malfunctions and helium leaks on its way to the orbital outpost.

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