TIJUANA, Mexico — Ten suspects have been detained in connection with last month’s shooting death of Tijuana photojournalist Margarito Martínez Esquivel, the top prosecutor for the state of Baja California confirmed Friday. Attorney Gen. Ricardo Iván Carpio Sánchez said an operation was still under way early Friday when information about five of the arrests was made public by Gen. Luis Cresencio Sandoval, Mexico’s defense secretary, during President Andrés Manuel López Obrador’s daily morning media briefing. Martínez, who covered crime and security issues in Tijuana, was shot to death Jan. 17 o…