The suspect in the Florida State University shooting used Nazi imagery and language in his online profiles.
The Harvard Square MBTA station was shut down for three hours following the shooting.
"The Israeli government's lack of will and ability to fight leads to this endless bloodshed on the streets," the Abraham Initiatives NGO said.
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The incident caused a huge panic among Afula's residents, who contacted security forces, with KAN reporting that they locked themselves in their homes.
Singapore detained two teenagers under internal security laws for extremist activities. One planned mosque attacks, while the other sought to join ISIS or marry an ISIS fighter.
The US attorney-general said that the United Healthcare killer carried out "a premeditated, cold-blooded assassination."
Police found that the suspect, a 41-year-old resident of al-Eizariya, had a criminal background, was known to security officials, and was Hamas-affiliated.
Israeli media later named the terrorist as Karem Jabarin, 25, from the village of Ma'ale Iron in northern Israel.
The victim sustained moderate wounds to his leg and was transferred to the hospital.