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Luigi Mangionewho is accused by authorities of killing the CEO of UnitedHealthcare Brian Thompsonreportedly wrote in a notebook that he considered bombing Manhattan to carry out the assassination, but that he didn’t want to “kill innocents,” a senior law enforcement source tells PEOPLE.

The notebook, which police reportedly found on Mangione, contained a to-do list related to the killing, the law enforcement source says, and discussed various methods of killing.

The source said Mangione, who is charged with murder by prosecutors in New York, would have preferred a targeted approach.

“What are you doing? You’re punching the CEO at the annual parasitic bean control convention,” Mangione wrote. “It is targeted, accurate and does not endanger innocents.”

Mangione was taken into custody at a McDonald’s in Altoona, Pennsylvania, on Monday, December 9, days after a masked, hooded gunman fatally shot Thompson outside the New York Hilton Midtown in Manhattan as the CEO headed to an annual investor event.

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Police allege that after his arrest, Mangione was found with a 3D printed ghost gun, a silencer and fake IDs. He was indicted in Pennsylvania on five charges, including forgery and weapons possession. He also faces possible extradition to New York, where he is charged with more serious crimes, including murder.

A law enforcement source previously told PEOPLE that Mangione was also found with a manifestoin which he allegedly wrote that he acted alone but that the murder ‘had to happen’.

“I apologize for any conflict or trauma, but it had to be done,” Mangione reportedly wrote. “Honestly, these parasites already had it.”

Thompson, 50, who was buried in a private setting, was the father of two sons.

Read the original article People