Kazmierczak had no arrest record and no known history of mental illness, and he had a valid state-required firearm ID card, so he had no problem buying the guns, one law enforcement source said.

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The process for registering with M-Pesa is very straightforward: it requires a PIN and an official form of identification (a passport or a national ID card) but there is no need for a bank account or a home address.

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Finally, the ID card is flashed at the gate no boarding pass needed and agents there hand the traveler a receipt with the seat number printed on it.

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