As the investigations continued Tuesday into two separate mass shootings allegedly perpetrated over the weekend by Marine veterans wielding assault rifles, one in Michigan and the other in North Carolina , numerous questions remain unanswered -- chief among them motive.

The attacks at a waterfront bar in Southport , North Carolina, and at a Church of Jesus Christ of Latter-day Saints in Grand Blanc, Michigan, left seven people dead and more than a dozen injured.

So far, federal and state investigators have shed little light on why the suspects, who had both been deployed to the Iraq War, allegedly committed the unrelated attacks.

No additional news conferences have been scheduled for Tuesday in either case.

Motive remains under investigation in both attacks

Investigators in Mi

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