Are mass killings on the increase?

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Oakland is reeling after a gun rampage at a small religious college left seven people dead, the latest in a long line of mass killings nationwide. But are such incidents on the rise? http://feeds.feedburner.com/~ff/rss/cnn_us?d=yIl2AUoC8zA</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=TitmPZFnQY0:UPDiBI_s8fo:yIl2AUoC8zA) http://feeds.feedburner.com/~ff/rss/cnn_us?d=7Q72WNTAKBA</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=TitmPZFnQY0:UPDiBI_s8fo:7Q72WNTAKBA) http://feeds.feedburner.com/~ff/rss/cnn_us?i=TitmPZFnQY0:UPDiBI_s8fo:V_sGLiPBpWU</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=TitmPZFnQY0:UPDiBI_s8fo:V_sGLiPBpWU) http://feeds.feedburner.com/~ff/rss/cnn_us?d=qj6IDK7rITs</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=TitmPZFnQY0:UPDiBI_s8fo:qj6IDK7rITs) http://feeds.feedburner.com/~ff/rss/cnn_us?i=TitmPZFnQY0:UPDiBI_s8fo:gIN9vFwOqvQ</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=TitmPZFnQY0:UPDiBI_s8fo:gIN9vFwOqvQ)
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