Washinton, June 2 -- Six people were injured on Sunday when a 45-year-old man yelled "Free Palestine" and threw incendiary devices into a crowd in Boulder, Colorado where a demonstration to remember the Israeli hostages who remain in Gaza was taking place, authorities said.

Six victims aged between 67 and 88 years old were transported to hospitals, the FBI special agent in charge of the Denver Field Office, Mark Michalek, said. At least one of them was in a critical condition, authorities said.

"As a result of these preliminary facts, it is clear that this is a targeted act of violence and the FBI is investigating this as an act of terrorism," Michalek said.

Michalek named the suspect as Mohamed Soliman, who was hospitalised shortly af...