Beväpnad attack mot franska tidningen Charlie Hebdo. 12 döda (7/1)

French law enforcement officers have been told to erase their social media presence and to carry their weapons at all times because terror sleeper cells have been activated over the last 24 hours in the country, a French police source who attended a briefing Saturday told CNN terror analyst Samuel Laurent.

Ahmedy Coulibaly, a suspect killed Friday during a deadly kosher market hostage siege, had made several phone calls about targeting police officers in France, according to the source.

A flurry of developments Saturday included claims linking one of the Charlie Hebdo attackers with the so-called underwear bomber, who sought to bring down a plane over Detroit in 2009.

The connection has not been confirmed by officials, and French investigators are still trying to piece together the web of connections between three suspects killed Friday as two sieges came to a bloody end.
---
A Yemeni journalist and researcher, Mohammed al-Kibsi, told CNN that he had met and spoken with Said Kouachi in Yemen in 2011 and 2012.

Kouachi, who was studying Arabic grammar, and underwear bomber Umar Farouk AbdulMutallab previously were roommates for one to two weeks in Yemen's capital, Sanaa, living in the same small apartment, al-Kibsi said. Abdulmutallab is serving a life sentence for trying to bring down a Northwest airlines flight over Detroit on Christmas Day 2009 with an underwear bomb.

Kouachi's residence was very near to the famous Al-Tabari School and he and AbdulMutallab used to pray together there, said al-Kibsi by telephone Saturday. It wasn't clear when they were roommates, but AbdulMutallab was arrested after the 2009 bombing attempt.

Al Kibsi said Kouachi first went to Yemen in 2009, and stayed until mid-2010 before leaving briefly and returning at the end of that year. Kouachi remained in Yemen most of 2011, according to Kibsi, who said he met the man twice.

U.S. officials have said Said Kouachi spent several months in Yemen in 2011, receiving weapons training with al Qaeda in the Arabian Peninsula.

But there has been no official confirmation of the claim that he and AbdulMutallab were associates.