WASHINGTON (AP) — The Supreme Court on Thursday blocked a $10 billion lawsuit Mexico filed against top firearm manufacturers in the U.S. alleging the companies' business practices have fueled tremendous cartel violence and bloodshed.

The unanimous ruling tossed out the case under U.S. laws that largely shield gunmakers from liability when their firearms are used in crime.

Big-name manufacturers like Smith & Wesson had appealed to the justices after a lower court let the suit go forward under an exception for situations in which the companies themselves are accused of violating the law.

But the justices found that Mexico hadn't made a plausible argument that the companies had knowingly allowed guns to be trafficked into the country. "It does not pinpoint, as most aiding-and-abetting clai

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