Dec. 15 (UPI) -- Prime Minister Anthony Albanese said Monday that his government will seek to strengthen Australia's already stringent gun laws after a father-and-son duo killed 15 people and injured 40 others on Sunday in one of the country's worst-ever shootings.

"People's circumstances change. People can be radicalized over a period of time. Licenses should not be in perpetuity," he told reporters during a Monday press conference.

The shooters have not been identified, although authorities have said the father was 50 years old and the son 24.

They are alleged to have opened fire late Sunday afternoon into crowds of people at the iconic Australian tourist destination. The 50-year-old father was shot and killed by police at the scene. The 24-year-old son has been hospitalized in serious but stable condition.

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