Who's flipping Smart cars?

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Four Smart cars were flipped on the streets of San Francisco -- for reasons authorities still don't know.http://feeds.feedburner.com/~ff/rss/cnn_us?d=yIl2AUoC8zA</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=BgATnPeZwMM:5OWu2JQCPck:yIl2AUoC8zA) http://feeds.feedburner.com/~ff/rss/cnn_us?d=7Q72WNTAKBA</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=BgATnPeZwMM:5OWu2JQCPck:7Q72WNTAKBA) http://feeds.feedburner.com/~ff/rss/cnn_us?i=BgATnPeZwMM:5OWu2JQCPck:V_sGLiPBpWU</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=BgATnPeZwMM:5OWu2JQCPck:V_sGLiPBpWU) http://feeds.feedburner.com/~ff/rss/cnn_us?d=qj6IDK7rITs</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=BgATnPeZwMM:5OWu2JQCPck:qj6IDK7rITs) http://feeds.feedburner.com/~ff/rss/cnn_us?i=BgATnPeZwMM:5OWu2JQCPck:gIN9vFwOqvQ</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=BgATnPeZwMM:5OWu2JQCPck:gIN9vFwOqvQ)
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