Tunisia has seen numerous clashes between the authorities and hardline Salafists since the uprising in 2011.
The interior ministry said security forces opened fire on Salafists attacking a police station.
During election campaigning, the Salafists' hard-line interpretation of Islam drew a lot of media attention.
This does not mean that the Brothers and the Salafists will now act in concert.
The Copts, Egypt's main Christian minority, comprising about a tenth of the 85m-odd population, particularly fear the Salafists.
Friday's results showed Islamist candidates, including ultra-conservative Salafists, winning 14 seats, while independent Islamists representing tribes took nine.
And there were accusations from more secular-minded Tunisians that Ennahda party and the more hardline Salafists were one and the same.
Whereas the Brotherhood has mellowed over years of long experience, the Salafists have scrambled to catch up with Egypt's fast-changing politics.
Already, the Brothers and the Salafists hold a majority in Egypt's parliament.
Ennahda was elected following the overthrow of President Zine el-Abidine Ben Ali in January 2011, but Salafists want stricter Islamic laws imposed in Tunisia.
BBC: Tunisia bars Ansar al-Sharia Salafist meeting in Kairouan
The manuscripts offend the Salafists less than the tombs or graven images do, though some address the Sufi school of Islam, which they scorn.
And so now these people who are being voted into the new government of Egypt, the Salafists, are calling openly for the return of jizya.
CENTERFORSECURITYPOLICY: Raymond Ibrahim: Shariah, Dhimmitude & the Copts
Like the Muslim Brotherhood, Egypt's Salafists represent a diversity of opinion.
The moderate Islamist party Ennahda was elected following the overthrow of President Zine el-Abidine Ben Ali last year, but Salafists want stricter Islamic laws imposed in Tunisia.
They also insist they have taken action against attacks by Salafists, everywhere from the American embassy to sacred Sufi shrines and art exhibitions deemed to be profane.
The perpetrators are widely assumed to be Salafists, adherents of a fundamentalist group influenced by Saudi Arabia that has made strong inroads, particularly among Egypt's poorest classes.
Police had earlier arrested a Salafi Islamist accused of assaulting the head of Manouba's public security brigade during clashes between alcohol sellers and Salafists in Tunis on Saturday.
But as Egypt's protest movement gained enough momentum to overthrow the Mubarak government, Salafists, many of whom had experienced imprisonment or torture under his regime, eagerly joined in.
"Salafists are not one group, " he insisted in our interview.
The Brotherhood, of course, the problem is, I think there's so many people who see the Brotherhood and the Salafists as sort of, you know, one's moderate and one's radical.
CENTERFORSECURITYPOLICY: Raymond Ibrahim: Shariah, Dhimmitude & the Copts
On September 24th, 14 Salafists were sentenced to death in an Egyptian court for an attack last year on a police station in northern Sinai that left several Egyptian policemen dead.
After he came to office in early 2011, Mr Faizov started to remove conservative imams and banned religious textbooks from Saudi Arabia, whereas his predecessor had largely left the Salafists alone.
But now as you see these Islamist parties, not just the Salafists, who are getting, you know, lots of, I think, twenty percent of the vote, and what are they doing?
CENTERFORSECURITYPOLICY: Raymond Ibrahim: Shariah, Dhimmitude & the Copts
Blogger Mahmoud Salem said a boycott would result in a parliament dominated by Mr Morsi's Muslim Brotherhood, ultraconservative Salafists, and former members of the government of Hosni Mubarak, ousted in February 2011.
Meanwhile, the Nour Party, which represents hard-line Salafists and came second to the Brotherhood in parliamentary elections, complains of being offered too few posts in government and of not being properly consulted.
Most prominent political groups, from the left-liberal April 6th Movement to the Islamist Muslim Brotherhood and even the more extreme Salafists, condemned the violence, though the Islamists were evasive about the entry into the building.
He jousted with Mr Moussa in the television debate and he is backed by some secular leftists as well as by the main party of Salafists, who won more than 20% of the seats in parliament.
Whereas the Salafists will say it now.
CENTERFORSECURITYPOLICY: Raymond Ibrahim: Shariah, Dhimmitude & the Copts
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