"We know that more attacks are being prepared, not just against France but also against other European countries," French Prime Minister Manuel Valls told RTL radio Monday.

He spoke after police raided homes of suspected Islamists across the country in the aftermath of the Paris shooting and suicide bomb attacks.

French police made 23 arrests and seized weapons including assault rifles, grenades and a rocket launcher in the nationwide sweep.

Besides the intensive national wide manhunt, the interior minister of France also called for the dissolution of "mosques where hate is preached". Bernard Cazeneuve made the comments during an interview on French television, according to a report by MSNBC.

France increased surveillance at religious and cultural centers earlier this year and has been cracking down on supposed radicalization in prisons. “Foreign preachers of hate will be deported [and their mosques] will be shut down," Cazeneuve told Agence France-Presse earlier this year.

BBC said Belgian police also launched manhunt after Paris attacks. As two of the attackers who brought carnage to Paris were French nationals living in neighboring Belgium. One of them blew himself up in the assault, while the other was arrested on Saturday as he tried to cross the border. In connection with the attack, Salah Abdeslam, 26, from a suburb of Brussels known as the 'jihadi' capital of Europe, is now the subject of a vast international manhunt.