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Will there be another terrorist attack causing more than 25 deaths in the United States before 2020?

The last terrorist attack in the United States to claim the lives of more than 25 victims took place on June 12 2016 when Omar Mateen, a 29-year-old security guard, killed 49 people and wounded 53 others in a terrorist attack inside Pulse, a gay nightclub in Orlando, Florida, United States. Orlando Police Department (OPD) officers shot and killed him after a three-hour standoff.

In a 9-1-1 call shortly after the shooting began, Mateen swore allegiance to the leader of the Islamic State of Iraq and the Levant (ISIL), Abu Bakr al-Baghdadi, and said the U.S. killing of Abu Waheeb in Iraq the previous month "triggered" the shooting. He later told a negotiator he was "out here right now" because of the American-led interventions in Iraq and in Syria and that the negotiator should tell the United States to stop the bombing.

It was the deadliest terrorist attack in the U.S. since the September 11 attacks in 2001.

This question asks: before January 1 2020, will there be any single terrorist attack in the United States involving the deaths of at least 25 people, excluding those of the perpetrator(s) of the attack?

An event will be considered a 'terrorist attack' if it is described as such by any agency of the Federal Government of the United States. Mass shootings or other criminal events that are not considered to be 'terrorist attacks' by Federal Government authorities do not count.

'United States' means all United States territory; any extent of region under the sovereign jurisdiction of the Federal Government of the United States, including all territorial waters, military bases, and all U.S. naval vessels.

In the event that victims die on after January 1 2020 but before February 1 2020 of injuries sustained in an event before January 1 2020, those deaths should be included.

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