The shooter who attacked the U.S. Immigration and Customs Enforcement facility in Dallas was targeting ICE agents, federal officials said at a news conference Thursday.

Nancy Larson, the acting U.S. attorney for the Northern District of Texas, said a collection of notes found at Joshua Jahn's residence showed an animus toward ICE agents and that he had been planning the attack for some time. Jahn legally purchased the 8mm bolt-action rifle used in the shooting last month, officials said.

Larson said that early Wednesday morning, Jahn was seen driving his car with a long ladder. Officials believe he used the ladder to access the roof of an office building near the Dallas ICE facility, from where he started firing at about 6:30 a.m.

Larson said he fired rounds the length of t

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