France has unveiled a raft of measures to curb radicalisation and better monitor jihadists two weeks after an Islamist killing spree in Paris that sent shockwaves across Europe.
The European Union is also expected to reveal new counterterrorism measures on Wednesday.
In Paris, Prime Minister Manuel Valls announced more than 700 million euros ($A1.05 billion) will be spent over the next three years on "the fight against terrorism" after the January 7-9 shootings which left 17 people dead.
The attacks by known Islamists exposed weaknesses in French intelligence, and Valls said some 3000 people with jihadist ties needed to be monitored, adding that the number of people with links to "terrorist networks" in Syria and Iraq had soared 130 per cent in the past year alone.
In response, France will create 2680 new jobs to fight extremism, just under half of them in the intelligence services.
"The number one priority, the number one requirement, is to further reinforce the human and technical resources of intelligence services," Valls said.
A large part of the effort to combat extremism is fighting radicalisation, and Valls announced an extra 60 Muslim chaplains would be hired on top of the 182 who already work in jails.
Two of the Paris gunmen, Amedy Coulibaly and Cherif Kouachi, are believed to have turned to radical Islam in prison where they met.
Valls last week said prisoners linked to extremist Islam could be isolated in jail, and one jail near Paris is currently experimenting with this method.
Authorities will also boost their fight against "cyber jihadism", he said.
France's worst attack in decades began on January 7 when Cherif and his brother Said Kouachi gunned down 12 people in an attack on satirical magazine Charlie Hebdo.
Coulibaly the next day shot dead a policewoman, and the day after that killed four people in a hostage drama in a Jewish supermarket. All three gunmen were killed by police in dramatic raids.
Paris prosecutor Francois Molins said four men believed to have assisted Coulibaly were charged with conspiracy to commit terrorist acts, and one of them for possession and transport of weapons.
Investigators discovered that three of the men had on several occasions visited specialist stores around Paris to "buy equipment" such as knives, a taser gun, tactical vests and pepper spray.
In Brussels, European commissioners will meet on Wednesday to discuss the 28-nation bloc's new counterterrorism strategy, including changes to the region's Schengen free travel area and intelligence cooperation.
Many EU states have pushed for a US-style database of air travellers' details that would help track Islamist suspects, but the European Parliament has so far blocked the scheme saying it would breach civil liberties.
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