THOUSAND OAKS, Calif. – Ian David Long, the gunman who killed 12 people at a country music bar, posted on social media during the deadly rampage, according to law enforcement officials.

The first call to law enforcement came in at 11:19 p.m. Wednesday, officials said. The authorities arrived at the Borderline Bar and Grill in Thousand Oaks, California, three minutes later. They entered the building at 11:25 p.m.

Long, 28, first posted on Instagram at 11:24 p.m: "It's too bad I won't get to see all the illogical and pathetic reasons people will put in my mouth as to why I did it," the military veteran said in the post. "Fact is I had no reason to do it, and I just thought....(exploitive), life is boring so why not?" Long posted, according to ABC News and Buzzfeed.

Three minutes later Long posted, "I hope people call me insane (two smiley face emojiis) would that just be a big ball of irony? Yeah... I'm insane, but the only thing you people do after these shootings is 'hopes and prayers'...or 'keep you in my thoughts'."

He added, "Every time...and wonder why these keep happening... --(two smiley face emojis)."

Long ended the killing spree by taking his own life.

The Ventura County Sheriff's office requested that the social media service preserve the communications until the posts can be subpoenaed with a search warrant or court order.

The posts have already been taken down. Authorities have not yet determined a motive for the attack.

A stretch of Rolling Oaks Drive, the street leading to Borderline Bar and Grill, remained closed Saturday.

Investigators wearing white hazmat-style suits and respirators over their faces continue to process the scene that Long left behind. They'll keep going until at least Tuesday, a Ventura County Sheriff's Department spokesman said.

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Contributing: Joshua Bowling, USA TODAY Network

Follow Dalvin Brown on Twitter: @Dalvin_Brown