The 9/11 terrorist attacks may have taken place 19 years ago, but the numbers surrounding them remain clear. The information below was gathered from the Encyclopaedia Britannica, the 9/11 Memorial and Museum and the Centers for Disease Control and Prevention.

19 militants associated with the Islamic extremist group al-Qaida hijacked 4 planes2 planes crashed into the World Trade Center, 1 crashed into the Pentagon and 1 crashed in Shanksville, Pa.77 minutes elapsed between the first and last crash2,977 people died, including more than 400 emergency personnel78 countries lost citizens in the attacks

300 dogs were used for search and rescue at Ground Zero3 months elapsed before fires stopped smoldering at the World Trade Center siteMore than 15 cancers have been associated with the fallout of the World Trade CenterMore than $5 billion has been paid to victims' families through the Sept. 11 Victim Compensation Fund.