French police have made seven arrests as they hunt for two suspects, brothers  Cherif and Said Kouachi, over the deadly attack on Charlie Hebdo satirical magazine staff in Paris.

The seven, connected to the two main suspects, were detained in the towns of Reims and Charleville-Mezieres, as well as in the Paris area, police said.

Photos were released of two brothers suspected of involvement in the attack.

France is mourning the 12 people killed when Charlie Hebdo was targeted by gunmen shouting Islamist slogans.

Reports are coming in from Paris of a shooting at a metro station in the south of Paris. At least one police officer is reported to have been injured. It is not known whether the incident is linked to the attack on Charlie Hebdo.

President Francois Hollande is conducting an emergency cabinet meeting in Paris.

A minute’s silence will be observed at midday across the country and the bells of Notre Dame in the capital will toll.

Arrest warrants were issued for Cherif Kouachi, 32, and his brother Said Kouachi, 34, said to be “armed and dangerous”. A third suspect, Hamyd Mourad, a brother-in-law of Kouachi brothers, has surrendered.

Cherif Kouachi was sentenced in 2008 to three years in prison for belonging to a Paris-based group sending jihadist fighters to Iraq.

A third suspect, 18-year-old Hamyd Mourad handed himself in to police in Charleville-Mezieres. He reportedly surrendered after hearing his name on the news.

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