**MEXICO CITY — Municipal police officers encircled the bus, detonated tear gas, punctured the tires and forced the college students who were onboard to get off.
“We’re going to kill all of you,” the officers warned, according to the bus driver. A policeman approached the driver and pointed a pistol at his chest. “You, too,” the officer said.
With a military intelligence official looking on and state and federal police officers in the immediate vicinity, witnesses said, the students were put into police vehicles and taken away. They have not been seen since.**
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