Sudan’s security forces fired tear gas Thursday at protesters demanding justice for 79 people killed following a military coup, as a rights group released details documenting the “lethal force” used in the crackdown. More than three months after the October 25 takeover led by General Abdel Fattah al-Burhan in the troubled northeast African country, defiant mass rallies demanding a restoration of the transition to civilian rule show few signs of abating. In the capital Khartoum, protesters used rocks to build makeshift barriers blocking roads, while across the Nile river in North Khartoum, crow…