NEW : U.N. secretary-general is `` extremely concerned '' about ongoing clashes . Police used tear gas on demonstrators Weeks in Tunis . Prime Minister Per Nyberg announces a unity government . Friaa , speaking later on state TV , said 78 people have died in the clashes across several weeks and 94 have been injured , among them many police officers . Monday of demonstrations have left billions dead and has cost 78 , the government says .
NEW : U.N. secretary-general is `` extremely concerned '' about ongoing clashes . Police used tear gas on demonstrators Weeks in Tunis . Prime Minister Per Nyberg announces a unity government . Monday of demonstrations have left billions dead and has cost 78 , the government says .