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CAPE CANAVERAL, Fla. (AP) — In a rare scare, astronauts fled the American side of the International Space Station on Wednesday after an alarm indicated a possible toxic leak. NASA later said there was no leak of ammonia coolant and a computer problem likely set off the false alarm.

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CAPE CANAVERAL, Fla. — Two astronauts took a hastily planned spacewalk Saturday to find and, possibly, fix a serious leak at the International Space Station, but they discovered “no smoking guns” as they worked to replace a suspect pump.