At least 10 people were killed and 27 were wounded Sunday in a series of attacks on Jordanian police.
Gunmen fired at police officers in two different locations and then moved into Crusader castle, which is a popular tourist destination in the city of Karak, Jordan's Public Service Directorate told CNN.
Security forces said in a statement late Sunday (4:30 p.m. ET) that four terrorists were killed in the castle after an hourslong standoff.
Jordan's Public Service Directorate told CNN that officers found automatic weapons and explosives while searching the fortress.
Authorities have not yet identified the gunmen and so far, no terrorist group has claimed responsibility for the attack.
Jordan's deputy prime minister and minister of foreign affairs tweeted after the attack: "Tragic day today. #Jordan remains resilient and tough. God rest the souls of our fallen in eternal peace. #oasis_of_stability."
CNN reports that seven members of security forces, two Jordanian civilians and a Canadian tourist are among the dead.
The death of a Canadian tourist could further deteriorate Jordan's tourism sector, which has suffered since the Islamic State, or ISIS, seized large parts of neighboring Syria and Iraq.
Another Canadian tourist was injured in the attack.
"Canadian officials in Amman are actively working with local authorities to gather additional information and are providing consular assistance to Canadians at this difficult time," said John Babcock, Canada's Global Affairs spokesman.
Canada issued a travel alert urging citizens to avoid traveling to the city of Karak.
In recent years Jordan has increased security at its tourist sites because of instability in the region.
The Associated Press contributed to this report.