A Nigerian dockers' union said on Thursday it had ordered a strike at Lagos' Apapa port after three men died, bringing the port to a standstill when it is struggling to clear the worst congestion for 25 years. The Maritime Workers Union of Nigeria (MWUN) said it had asked its members to stop work following an incident in which three men died after inhaling poisonous fumes on Wednesday. "We received a report yesterday that two of our members died at the Apapa port after inhaling dangerous gas while working on a vessel," union officer Tony Anyanwu said. Nigerian Ports Authority (NPA) spokesman Babatunde Sanni said he was not aware of the deaths or any walkout by workers.