Colombia's largest rebel group, the Farc, has blown up a pipeline leaving at least 16,000 people without water, authorities say, according to BBC News.

The attack happened in the municipality of Catatumbo, in northern Colombia.

A river was contaminated by oil that spilled out of the pipeline and the water supply had to be cut, the local authorities said.

Attacks on infrastructure have increased since the Farc suspended its unilateral ceasefire on 22 May.

In an unrelated incident, four military personnel were killed when they stepped on landmines in the southern region of Caqueta. Four others were injured.

The area had been mined by the Farc (Revolutionary Armed Forces of Colombia), the military said.