Two women were stabbed to death in Lisbon’s Ismaili Muslim Centre.
Police say the suspect was Afghan and was seen with a large knife. He was then shot on the spot.
He refused to surrender to officers and moved toward them, police stated in a statement.
He was taken into police custody after he was arrested.
According to Narzim Ahmad, an Ismaili community leader, the victims were Portuguese employees at the centre.
Other people were also injured in the attack on the Ismaili center, which occurred just before 11 a.m. on Tuesday.
According to Prime Minister Antonio Costa, “All evidence points towards this incident being isolated.”
He said that police were still investigating the attack, and it was too early to speculate on a motive.
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Ismailism can be described as a branch or Shia Islam. Ismailis can be found in over 25 countries and are culturally diverse.
The centre was opened in Lisbon by Prince Karim Aga Khan in 1998. He is recognized by some of his followers as their spiritual leader.