Mr Le Drian told Europe 1 radio Mr Le Guen had "evidently already fought in jihadist groups".
Speaking on French radio Europe 1 Friday, Sarkozy questioned the logic of Bayrou's decision to back Hollande.
CNN: French presidential rivals enter final day of campaigning
Speaking on French Europe 1 radio, Mr Tapie said he was "not at all worried" about the investigation.
"When you leave the centre of captured cities, you meet jihadis left behind, " Mr Le Drian told France's Europe 1 Radio.
The French radio station Europe 1 said the arrests were connected to investigations into planned attacks by Islamic militants in France.
Interior Minister Claude Gueant told French radio station Europe 1 on Friday that he feared a serial killer could be responsible.
He told Europe 1 that a French national found fighting for the militants had been taken prisoner and would be extradited to France.
France has sent several hundred troops to join the fight and plans more raids on Monday, French Defense Minister Jean-Yves Le Drian told Radio Europe 1.
The French soldier was on a group patrol as part of a national protection program when he was attacked from behind, prosecutor Robert Gelli told Europe 1 radio.
"We knew this part of Mali was potentially the sanctuary of AQIM (al-Qaeda in the Islamic Maghreb), and we weren't wrong, " he told Europe 1 radio from Mali.
Regarding reports of Belmokhtar's death, Adm Edouard Guillaud told Europe 1 radio that he was "extremely cautious", pointing to reports on jihadist internet forums that he may still be alive.
BBC: Islamist commander Abou Zeid's death in Mali 'probable'
Speaking from Bamako, Mali, on Europe 1 radio, Jean-Yves Le Drian said he'd toured the "sanctuary of al Qaeda in Mali" and saw the radical Islamists' arsenal sitting in caves.
"There's a process we're engaged in to evaluate the efforts made by Greece in recent months, which we know was set back by elections, " European Affairs Minister Bernard Cazeneuve said on France's Europe 1 radio.
Stocks in Europe lost 1.7% for the week, as their rally attempt also failed.
Western Europe buys 1.4 million barrels from Saudi Arabia, 19% of net imports.
Although he reportedly came second to Pope Benedict XVI during the 2005 conclave, few had predicted the election of the first pope from outside Europe in 1, 300 years.
The hardest hit major market: The U.S., where sales of footwear, apparel and equipment dropped 4%, compared to a 1% decline in Europe and a 1% increase in Asia.
Cahuzac's lawyer, Gilles August, said on Europe-1 radio Thursday that the accusations are "based on nothing but air" and that the minister has no plans to resign over them.
However, not long after the adoption of this act, the price of gold rose in Europe to 16:1 so gold in the US ended up in Europe.
FORBES: 2012: Good Money And Jobs vs. Easy Money And Stagnation
The Stoxx Europe 600 rallied 1.3%, while Germany's DAX rose 1.9% and France's CAC-40 rallied 2%.
The Stoxx Europe 600 fell 1.5% in response to disappointing economic news for the euro zone.
European markets were in broad decline, with the Stoxx Europe 600 down 1.1% for its second straight loss.
In Europe, the Stoxx Europe 600 rose 1.1%, as Greece and its private-sector creditors prepared to resume negotiations.
Among other gains in international stock-market benchmarks, Europe's Stoxx Europe 600 advanced 1.1%.
European markets were broadly higher, with the Stoxx Europe 600 up 1.8% to its highest close since June 2008.
Pricing in Europe begins at 1, 000 Euros for the 23-inch model, rising to 2, 000 Euros for the full-spec 27-incher.
The Stoxx Europe 600 gained 1.2% to end its fourth losing week out of five on a bright note.
Outlook by geography : Western Europe, down 1%, after down 7% in 2012.
FORBES: CES: 2012 Global CE Spending Fell 1%; Seen Up 4% In 2013
The Stoxx Europe 600 rallied 1.3% in response to news of relaxed bailout conditions for Cyprus and better-than-expected economic data.
The Stoxx Europe 600 rallied 1.1% in response to news of relaxed bailout conditions for Cyprus and better-than-expected economic data.
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