1.   And though it claims to have given up the practice, the FARC has sabotaged oil pipelines, contaminating rivers and crops.

2.   People routinely sabotage pipelines to sell fuel on the black market in the Niger Delta, the oil-producing area that has been kept in extreme poverty.

3.   Aside from kidnappings, multinational firms have experienced frequent disruptions by militants who capture oil facilities and sabotage pipelines.

4.   In the past decade, guerrillas have sabotaged pipelines hundreds of times to force out foreign oil companies and put economic pressure on the government.

5.   Kurdish rebels have sabotaged pipelines in the region before.

6.   Multinational firms that pump the bulk of the oil have experienced frequent disruptions by militants who kidnap workers, seize oil facilities and sabotage pipelines.

7.   Multinational firms that pump the bulk of the oil have experienced frequent disruptions by the militants who kidnap workers, seize oil facilities and sabotage pipelines.

8.   Multinational firms such Shell and Chevron that pump the bulk of the oil have experienced frequent disruptions by militants who kidnap workers, capture oil facilities and sabotage pipelines.

9.   Officials had not determined the cause of the morning blast, and they did not appear to be blaming leftist guerrillas who frequently sabotage oil pipelines.

10.   There was no immediate comment from the ELN, which typically sabotages pipelines in unpopulated areas.