A bomb exploded on Tuesday at the main power station of Brazil's top port of Santos but the port suffered no interruption in power, said the port authority Codesp. "The main power station collects energy from the regional grid and powers nearly all the port's operations. Energy supply was uninterrupted and police are investigating the nature of the bomb," said a Codesp Port Authority official. Santos, Latin America's largest port, has been in the midst of a dockworkers' strike since last Tuesday. A local labor court declared the strike an act of civil disobedience on Friday and ordered the workers back on the job. A high-tension power line tower that brings electricity to ship terminals at Santos was sabotaged early Monday morning, at which time a portion of the port shut down until 6 p.m.