Rio's Olympic organizers directed inquiries to Rio Mais, but said other work in organizing the games continued.
A team of IOC inspectors visiting Rio two weeks ago, headed by Olympic hurdle champion Nawal El Moutawakel, said the games faced "challenging deadlines."
IOC President Thomas Bach has repeated often that Rio "doesn't have a day to lose," and some fear it could face chronic delays similar to those hitting the upcoming World Cup.
The strike adds to a growing list of problems confronting Rio organizers with the games just over two years away.
Construction on the second largest cluster of venues in northern Rio de Janeiro, in an area called Deodoro, has yet to begin. Work on the Olympic golf course has also been delayed.
Severe water pollution in Rio's Guanabara Bay, the venue for Olympic sailing, is a growing concern with a test event scheduled there in August. IOC officials have said they will not risk the athletes' health if the water is unsafe.
Many of the delays are rooted in disputes among Brazil's three levels of government over who pays for what. Most estimates suggest Brazil will spend about $15 billion on the Olympics, a mix of public and private money.
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