Washington, US (BBN)-US Secretary of State John Kerry has described Islamic State (IS) militants as "psychopathic monsters" following Friday's deadly attacks in Paris.
Kerry, in Paris for talks with President Hollande, said the US stood "shoulder to shoulder" with France, reports BBC.
Hollande says France is committed to destroying IS. French air strikes hit the militants in Syria overnight.
IS has said it carried out the attacks on bars, restaurants, a concert hall and a stadium in which 129 people died.
A huge manhunt is still under way for a suspected member of the group, Salah Abdeslam, who was believed to have fled across the border to his native Belgium.
Belgian police have released more pictures of the suspect.
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Interior Minister Bernard Cazeneuve told France Info TV that 128 raids on suspected Islamist militants had been carried out overnight on Monday to Tuesday.
More than 160 raids were made earlier on Monday, with 23 people arrested and dozens of weapons seized.
Belgium's government has raised its terror threat level because of the failure so far to arrest Abdeslam, causing Tuesday's football match between the national team and Spain to be cancelled.
The BBC's Barbara Plett Usher, who is travelling with Kerry, says his visit to Paris is to demonstrate Washington's support for a key ally.
In the wake of the attacks, the two countries have tightened their military co-operation, boosting the exchange of intelligence to help French air strikes against IS.
Meanwhile early on Tuesday, French warplanes carried out fresh strikes against the IS stronghold of Raqqa in northern Syria, the army general staff said, destroying a command centre and training centre.
MORE ON THE PARIS ATTACKS
What happened in Paris? How events unfurled on Friday evening in the French capital.
Who were the victims? Details of some of the 129 people killed in the attacks.
The fight against Islamic State at home and abroad The attacks have highlighted once again the difficulties in providing total security in a modern, open Western capital.
Most wanted: Alleged mastermind Profile of key suspect Abdelhamid Abaaoud, thought to be behind the attacks and now based in Syria.
Anonymous 'declares war' on Islamic State The hacking group vows to use its knowledge to "unite humanity" and "hunt down" IS members.
Standing outside the US embassy on Monday, Mr Kerry called France America's oldest friend and first ally, and said the only response to the attacks must be a fierce sense of solidarity.
"Your American sisters and brothers will stand with you shoulder to shoulder as we have stood together throughout history. Tonight we are all Parisians," he said.
Kerry added that the fight against IS was not a clash of civilisations.
"They are in fact psychopathic monsters. There's nothing civilised about them," he said.
After he spoke the building was illuminated in the blue, white and red of the French flag.
STATE OF EMERGENCY
The attacks in Paris - which also left more than 400 people wounded, some critically - have galvanised Western countries in their campaign against the so-called Islamic State.
UK Chancellor George Osborne is due to say in a speech on Tuesday that IS is trying to develop the ability to launch deadly cyber-attacks on the UK.
During a visit to the GCHQ listening station in Cheltenham, he is to announce that the UK's investment in fighting cybercrime will double.
Prime Minister David Cameron has already announced extra funding for UK special forces, such as the elite SAS, following Friday's attacks.
President Hollande told a rare joint session of the French parliament on Monday that he would table a bill to extend for three months the state of emergency declared after the attacks.
Parliament will vote on the measure on Wednesday.
Also, Cazeneuve said 115,000 police, gendarmes and military would be mobilised.
According to Prime Minister Manuel Valls, intelligence services have files on 10,500 individuals who have been radicalised to a greater or lesser extent.
Seven people were detained in Belgium over the weekend, two of whom were charged on Monday with "participating in a terrorist attack".
The other five were later released, including Mohammed Abdeslam, the brother of two suspects - Brahim Abdeslam, killed during the attacks, and Salah Abdeslam.
SUSPECTED PARIS ATTACKERS
Salah Abdeslam, 26 - urgently sought by police
Brahim Abdeslam, 31 - named as attacker who died near Bataclan concert hall
Omar Ismail Mostefai, 29, from near Paris - died in attack on Bataclan
Bilal Hadfi, 20 - named as attacker who died at Stade de France
Ahmad al-Mohammad, 25, from Idlib, Syria - died at Stade de France (unverified)
Samy Amimour, 28, from near Paris - suicide bomber at Bataclan
Two other attackers died during the assaults in the city
Authorities say that one of the attackers was the same man who used a Syrian passport in the name of Ahmad al-Mohammad and whose fingerprints match those taken by the Greek authorities after he arrived with migrants on the island of Leros in October.
As well as the attackers themselves, investigators are also reported to be focusing on a Belgian of Moroccan descent who is described as the possible mastermind of the attacks.
Abdelhamid Abaoud, 27, lived in the Molenbeek neighbourhood of Brussels, as did two of the attackers, and is now believed to be based in Syria, where he has risen through the ranks of IS.
MAIN ATTACK SITES:
Bataclan concert venue, 50 Boulevard Voltaire, 11th district - 89 dead when stormed by gunmen, three of whom were killed; another gunman died nearby
La Belle Equipe, 92 rue de Charonne, 11th district - 19 dead in gun attacks
Le Carillon bar and Le Petit Cambodge restaurant at rue Alibert, 10th district - 15 dead in gun attacks
La Casa Nostra restaurant, 92 rue de la Fontaine au Roi, 11th district - five dead in gun attacks
Stade de France, St Denis, just north of Paris - three attackers and a bystander killed
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