SYDNEY -- A teenager has been accused of wounding a Christian bishop and priest during a church service in a second high-profile knife attack to rock Sydney in recent days, leaving communities on edge, leaders calling for calm and a besieged church urging against retaliation.

The 16-year-old was overpowered by the shocked congregation at Christ the Good Shepherd Church after he allegedly stabbed Bishop Mar Mari Emmanuel and Fr. Isaac Royel during a service on Monday night that was being streamed online.

Police have not commented on reports that the boy's fingers were severed by parishioners in the Orthodox Assyrian church in suburban Wakeley, but confirmed his hand injuries were "severe."

Video of the attack spread quickly on social media and an angry mob converged on the church demanding vengeance. They hurled bricks, bottles and fence boards at police, who temporarily barricaded the boy inside the church for his own safety. Many in the crowd chanted "an eye for an eye" and "bring him out."

Several people including police officers required hospital treatment following the hourslong riot.

The church said in a statement on Tuesday it "denounced retaliation of any kind." Police stood guard around mosques in parts of Sydney on Tuesday after reports that text messages were circulating urging the Assyrian Christian community to retaliate against Muslims.

Police and community leaders said public anxiety had been heightened by a lone assailant's knife attack in a Sydney shopping mall on Saturday that killed five women and a male security guard who attempted to intervene. The 40-year-old assailant, Joel Cauchi, had a history of mental illness and trouble with women and a fascination with knives. He was shot dead by police.

Prime Minister Anthony Albanese urged the public not to take the law into their own hands.

"We understand the distress and concerns that are there in the community, particularly after the tragic event at Bondi Junction on Saturday," Albanese told reporters, referring to the Westfield Bondi Junction shopping mall.

"But it is not acceptable to impede police and injure police doing their duty or to damage police vehicles in a way that we saw last night," Albanese added.

News South Wales Police Commissioner Karen Webb on Tuesday declared the church attack a terrorist incident, but not the shopping mall rampage.

The declaration gives police expanded powers to stop and search people, premises and vehicles without a warrant.

Webb said the teen's comments and actions pointed to a religious motive for the attack. She didn't detail the wording of the comments that led her to believe he had been religiously motivated.

Ten Network television reported the boy had told churchgoers who restrained him, in Arabic: "If they didn't insult my Prophet, I wouldn't have come here."

New South Wales Premier Chris Minns said state police were urging social media platforms to shut down accounts posting misinformation that incited violence since Monday's stabbing.

"New South Wales Police and community leaders have been battling misinformation spreading around the web inciting community members to rush to particular religious facilities and mosques and churches on the hint or the rumor of some kind of violent activity taking place," Minns told Australian Broadcasting Corp.

"It's very difficult to maintain community cohesion when outright lies are spread within the community inciting the worst fears of particularly young people," Minns added.

The teen suspect was in hospital on Tuesday under police guard. He has yet to be charged.

Webb said he had been known to police, but was not on a terror watch list. He had been convicted in January for a range of offenses including possession of a switchblade knife, being armed with a weapon with an intention to commit an indictable offense, stalking, intimidation and damaging property, ABC reported.

A Sydney court released him on a good behavior bond, ABC reported.

The boy used a switchblade, which is an illegal weapon in Australia, in Monday's attack, ABC reported.

Juvenile offenders cannot be publicly identified in New South Wales.

The church in a message on social media said the bishop and priest were in stable condition and asked for people's prayers. The church said in a statement on Tuesday the 53-year-old Iraq-born bishop's condition was "improving."

Emmanuel has a strong social media following and is outspoken on a range of issues. He proselytizes to both Jews and Muslims and is critical of liberal Christian denominations. He also speaks out on global political issues and laments the plight of Palestinians in Gaza.

The bishop, described in local media as a sometimes divisive figure on issues such as COVID-19 restrictions, was in the national news last year over comments about gender.

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McGuirk reported from Melbourne, Australia.