Leftist guerrillas attacked an oil field Friday for Ecopetrol in northeastern Colombia, as part of an escalation of attacks on the economic infrastructure of the country that holds in tension the peace negotiations between the Government and the FARC. Ecopetrol said the two attacks affected the Tibú field, located in the department of Norte de Santander, which borders Venezuela, with a production of 1,800 barrels of oil per day. "Ecopetrol rejects the attacks against a team workover and field season Tibú, Norte de Santander, which endangered the lives of workers and neighboring communities," said a statement from the company that produces 750,000 barrels of oil a day.