(Associated Press) Lithium batteries that can leak corrosive fluid and start fires have emerged as the chief safety concern involving Boeing’s 787 Dreamliner, a problem that apparently is far more serious than government or company officials acknowledged less than a week ago.

The Federal Aviation Administration late Wednesday grounded Boeing’s newest and most technologically advanced jetliner until the risk of battery fires is resolved. The order applies only to the six Dreamliners operated by United Airlines, the lone U.S. carrier with 787s. But other airlines and civil aviation authorities in other countries will be under pressure to follow suit or face possible accusations of taking unnecessary risks with public safety.

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