The man had been carrying three handguns and one shotgun, along with the knives, Sgt. Mercedes Fortune, a Phoenix police spokeswoman, told the media on Thursday.
Fortune said the man intended to harm Phoenix police and had been taking pictures of officers and posting them on social media, reports USA Today.
Police did not immediately release the man's name but said he is 30 years old.
The four-day entertainment and comic convention is being held at the Phoenix Convention Centre.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.