* Largest African LNG terminal blocked for 2 days
* Nigeria accounts for 7 pct of global LNG supply
ABUJA, May 6 (Reuters) - Nigeria's Liquefied Natural Gas(LNG) exports have been delayed after a security agency blockedships from accessing the Bonny terminal from May 3 to May 5, thestate-LNG firm said on Monday.
The Nigerian Maritime Administration and Safety Agency(NIMASA) stopped the ships from entering or leaving the 22million tonnes-a-year terminal because it said Nigeria LNG wasnot paying its freight levies.
"Nigeria LNG is a law-abiding corporate citizen and pays allits lawful dues and taxes ... NLNG's position had been that itwas exempted from the levies," Nigeria LNG said in a statement.
Access was denied from 1600 GMT on Friday until anunspecified time on Sunday, said Nigeria LNG.
One ship loaded with LNG was prevented from exiting theterminal during the blockade and two ships for loading could notenter, an LNG industry source told Reuters.
The Nigerian National Petroleum Corporation owns 49 percentof Nigeria LNG with Shell holding 25.6 percent, Total 15 percent and Eni 10.4 percent.
Nigeria ships over 250 cargoes of LNG a year, contributingaround 7 percent of global supply and accounting for 4 percentof GDP in Africa's second largest economy, according to NLNG.
Buyers of Nigeria's LNG include Spain's Repsol,Italy's Enel, Britain's BG Group France's GDFSuez and Portugal's Galp.
Nigeria LNG lifted a force majeure - a clause freeing thecompany from supply obligations due to circumstances outside itscontrol - on exports two weeks ago, initially imposed because ofa ruptured pipeline to a Shell gas field.