BERLIN (CBS / AP) — A senior European Space Agency official says that the signal from the experimental Schiaparelli probe cut off before its landing on Mars, which he says isn’t a good sign.

Paolo Ferri, ESA’s head of operations, said the signal “stopped shortly before landing.”

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He cautioned that more analysis of the data was needed to understand what had happened to the experimental lander during Wednesday’s descent.

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He says it is too soon to jump to conclusions but “it’s clear that these are not good signs.”

He said that an update is expected on Thursday.

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