TALLAHASSEE, Florida (AP) — Florida State University alumnus and attorney who shot three people at the school's library early Thursday believed the government was targeting him for persecution, detailing his thoughts in a journal and in videos detectives obtained, authorities said.

Officers fatally shot Myron May, 31, during an exchange outside the library about 12:30 a.m. May reloaded at least once and tried to enter the library, where 300 or more students were studying for exams, but was blocked by lobby security barriers that permit only students and staff inside, Tallahassee Police Chief Michael DeLeo said.

The shooting sent students scrambling for cover in the book aisles and barricading themselves in with desks amid screams from classmates.

One person is in critical condition and one is in good condition at a local hospital, while the third was released.

May's Facebook page shows he posted mostly Bible verses and links to conspiracy theories about the government reading people's minds.

According to a Las Cruces, New Mexico, police report last month, May was a subject of a harassment complaint after a former girlfriend called to report he came to her home uninvited and claimed police were bugging his house and car.

The report also said May recently quit his job and was on medication.

No charges were filed.

Abigail Taunton, who runs a foster home in the Florida Panhandle, told AP that May was staying at a guest house she owns.

She said she had known him since he was about 13 or 14 and that he ran cross country with her kids and stayed at her house a lot. She said he lived with his grandmother after coming out of a "bad situation" with his parents.

"My heart's broken. In a million years I wouldn't have thought he'd do something like this."

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Associated Press writers Russell Contreras in Albuquerque, New Mexico, and Jeff McMurray in Chicago contributed to this report.

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Associated Press writer Jeff McMurray in Chicago contributed to this report.