	s held up at calcutta some indian s have been held up at calcutta port after four days of industrial action by local seamen a spokesman for the owners association insa said the dispute has prevented local crewmen signing on and off but has not affected foreign s with international crews docking at calcutta which exports tea and jute and imports machinery crude oil and petroleum products the spokesman said foreign s may also suffer if dock workers join the action he said the ping corporation of india sci has asked its s to avoid the port until the dispute is over national union of seafarers in india president leo barnes said reuter 
