Here's the ISIS message the female San Bernardino shooter posted on Facebook during the attack

An FBI document may confirm that the female who helped carry out a shooting at a community center in San Bernardino, California that left 14 dead earlier this month did in fact pledge allegiance to ISIS while the attack was ongoing.

The FBI arrested a friend of the married couple who carried out the shooting on Thursday, and the FBI affidavit discloses some of the evidence the government has against the friend, Enrique Marquez Jr.

In the document, the FBI notes that after the December 2 attack started, a post on a Facebook page associated with Tashfeen Malik stated: “We pledge allegiance to Khalifa bu bkr al bhaghdadi al quraishi.” The FBI agent noted that he believes the post is referring to Abu Bakr al-Baghdadi, the leader of the terrorist group ISIS (also known as the Islamic State, ISIL, and Daesh).

The attack started at about 10:58 a.m. local time, and the Facebook post appeared at 11:14 a.m.

Authorities have charged 24-year-old Marquez, a former neighbour of the couple, with conspiring to provide material support or resources to terrorists. Marquez is suspected of buying the rifles used in the attack and plotting terrorist attacks with the male shooter, Syed Rizwan Farook, in 2011 and 2012.

Farook, a US citizen, and Malik, who came to the US from Pakistan to marry Farook, opened fire on the Inland Regional Center, a county facility that provides services to the disabled.

Investigators reportedly believe that Malik also expressed jihadist sympathies online before she was approved for a US K-1 visa, but those messages were likely sent privately to a small group of friends in Pakistan, where authorities believe Malik was radicalized.

While there isn’t clear evidence pointing to ISIS ordering and coordinating the San Bernardino shooting, it appears that Malik and Farook supported the terrorist group and carried out the attack in its name. This underscores the danger of terrorists who aren’t plugged into established networks and can therefore fly under the radar and remain undetected by authorities.

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