Authorities in the southern African, currently Africa's biggest oil producer, declined to comment. On Friday the government also did not respond to a FLEC claim that nine Angolan soldiers had been killed in the region.
Luanda rarely responds to such claims in a region where separatists have been waging a low-intensity guerrilla campaign for several decades.
The latest clashes broke out on Saturday and Sunday near the border with the Democratic Republic of Congo, FLEC said in a statement.
FLEC, which wants independence for a territory that accounts for half of Angola's oil output, has been more vocal since the death this year of its 88-year-old founder, Nzita Tiago, in exile in France.
Men claiming to be rebels boarded an offshore Chevron gas platform in late May and threatened foreign petroleum workers in a rare sign of the simmering instability in heavily guarded Cabinda.
The incident cast doubt on Luanda's assertion that FLEC has fizzled out since a 2007 peace deal. Analysts say the group does not have the ability to affect oil output in Angola, nearly all of which is offshore.
--reuters--