Nigeria's oil workers' unions are considering pulling all their members out of the Niger delta after a series of abductions. Two oil unions have called an emergency meeting after the kidnappings of 17 workers, mostly foreigners, in the last month. Oil companies have imposed strict travel restrictions on their staff to try to keep them safe. Government attempts to rescue a Nigerian hostage in the delta ended in a shoot-out on Sunday. Up to 10 members of the Movement for the Emancipation of the Niger Delta were killed and it is still unclear whether the hostage, an employee of Royal Dutch Shell, survived. "We are afraid for the safety of our members and anyone working in the Niger Delta. We feel the government is not doing enough," said Peter Esele, president of the Petroleum and Natural Gas Senior Staff Association of Nigeria.