Nasa says no return date yet for astronauts and Boeing capsule at space station

The Starliner spacecraft docked to the Harmony module of the International Space Station (Nasa via AP)

Already more than a month late getting back, two Nasa astronauts will remain at the International Space Station until engineers finish working on problems plaguing their Boeing capsule, officials said.

Test pilots Butch Wilmore and Suni Williams were supposed to visit the orbiting lab for about a week and return in mid-June, but thruster failures and helium leaks on Boeing’s new Starliner capsule prompted Nasa and Boeing to keep them up longer.