Authorities have only been able to give a vague description of him as being stocky and about 5 feet, 8 inches tall.

The story of the Syrian-Australian Muslim shop owner who put an end to the rampage of one of the shooters on Sunday has been seized upon by a country desperately seeking comfort after one of its darkest hours: the slaying of 15 people as they celebrated their Jewish faith.

Law enforcement is pleading with the public to help in the manhunt, releasing additional images, requesting any new details or observations and offering a reward.

Authorities released a person of interest and provided video and still images of a different man they want to locate.

For the students in the Brown University review session, concerns about grades and questions about economic concepts would be forgotten in an instant.

A bystander, identified by 7NEWS Australia as Ahmed al Ahmed, seen disarming a gunman at Sydney's Bondi Beach during a Hanukkah event is being heralded as a hero.

New South Wales Premier Chris Minns on Sunday praised the man's actions, calling it "the most unbelievable scene."

Police say a suspected gunman in Sydney’s Bondi Beach massacre has been charged with 59 offenses including 15 charges of murder.

Brown University student Joseph Oduro said he was in a lecture hall when a gunman wielding a rifle burst through the door and locked eyes with him.