Nigerian oil militants say they have blown up another Chevron oil well in a rejection of the government's overture offering peace talks.

Wednesday's bombing comes the day after the government appealed for a cease-fire to allow dialogue. The Niger Delta Avengers say they will not negotiate.

It's the fourth attack in as many weeks on a facility of the U.S.-based oil company, which last month was forced to halt operations at its 160,000-barrel a day Escravos export terminal. The Avengers also have blown up installations of Dutch-British Shell and Italy's Agip, halving Nigeria's production to about 1.2 million barrels a day.

The Avengers announced on Twitter that "@NDAvengers blow up Well RMP 20."

Chevron refuses to comment on attacks in Nigeria.