Two Mexican activists missing after an attack on an aid convoy, in which one Mexican and one Finn were killed, returned on Thursday and said two missing journalists were alive. The activists said one of the journalists had been shot in the foot so they could not leave a mountainous area where they had fled after Tuesday's attack in San Juan Copala, southern Mexico, where tensions are high between indigenous Trique groups and authorities. Police were unable to enter the volatile area on foot on Thursday due to gunfire, the father of the injured journalist, David Cilia, told selfnews. A police helicopter, carrying the editor of Contralinea magazine -- for which both journalists work -- and Cilia's father, headed to the area late Thursday, an selfnews journalist saw. The southern Oaxaca state has a history of political violence. State Governor Ulises Ruiz said on Wednesday that he did not understand why foreigners had been traveling 'unilaterally' to a conflict area. Finnish activist Jyri Jaakkola and Mexican Alberta Carino were killed in Tuesday's attack on a convoy carrying food and supplies, Mexican activists and a Belgian, a German and an Italian to a self-declared autonomous zone that had been cut off by rival armed groups. A compatriot of Jaakola who was also traveling in the convoy told selfnews on Thursday that the Finnish activist had saved her life. 'Jyri covered me with his body so the bullets wouldn't hit,' said Meri Marjaana Mononen from the Finnish Union for Peace NGO. 