26-year-old man arrested in Pennsylvania for murder of UnitedHealthcare CEO using homemade "ghost gun"

Question: Could you summarize "A "strong person of interest" was arrested in Pennsylvania on Monday in connection to the killing of UnitedHealthcare CEO Brian Thompson, officials said. The 26-year-old man in Altoona was identified as Luigi Mangione and arrested on weapons charges, NYPD Commissioner Jessica Tisch told reporters. He was found with a gun similar to the one used in the shooting of Thompson and had a fake ID with the same name the suspect used at a New York City hostel, police said. “Additionally, officers recovered a handwritten document that speaks to both his motivation and mindset,” Tisch said. The person being questioned was at a McDonald’s in Altoona, where an employee thought he looked suspicious and called police, police said. "We believe we have a strong person of interest," New York Mayor Eric Adams said. The document speaking to his motivation came in the form of three handwritten pages, evidence that's now in possession of Altoona police, New York City officials said. "It does seem that he has some some ill will toward corporate America," Chief of Detectives Joseph Kenny said. The man in custody also had a weapon that might been homemade and thus off the charts of any law enforcement or government agency. “The information we’re getting from Altoona is that the gun appears to be a ghost gun and may have been made on a 3D printer,” Kenny said. “He was in possession of a ghost gun that had the capability of firing 9 mm round and a suppressor.” Police said the public's help played a key role in finding the suspect." into 2 short sentences.