The polar vortex will soon elongate over North America with a dangerous cold moving into sections of Canada and the U.S.

July 10-13, 2023 — Jabbar visits Ontario, Canada ... purchases a semi-automatic rifle in a private sale in Arlington, Texas. Authorities say the seller had no knowledge of Jabbar's intentions.

Another winter storm in the U.S. could disrupt flights at Toronto Pearson Airport in Mississauga, Ontario. On Monday, a deadly storm swept across the U.S. from Ohio Valley to the Mid-Atlantic. At least four people died and dozens were injured.

The investigation is now "crossing state and international borders," as law enforcement pieces together Shamsud-Din Jabbar's pre-attack movements, according to an FBI special agent.