Strong winds and high seas lashed structures at Rio 2016 Olympic Games venues as fresh doubts were raised about the quality of local construction work.
The most serious incident occurred on Saturday at the Marina da Gloria, the starting point for sailing events, where waves partially destroyed the main ramp for sailors to access the water, reports Xinhua.
Organisers said the company responsible for building the ramp was inspecting the damage, but gave no estimate on when it would be repaired.
Wild weather also hit Copacabana beach, where the tide reached TV studios built on the sand.
Workers immediately erected a wrought-iron levee to stop waves from battering the structure. Sand barriers were also built to protect the beach volleyball arena.
Rio's construction standards were questioned in April when a new elevated bike track collapsed into the sea, killing two people.
Rio to close 38 streets
Authorities in Rio de Janeiro have stepped up security for Friday's Olympic Games opening ceremony to combat the threat of terrorism. Some 38 streets around Maracana stadium will be closed for up to 20 hours before the ceremony starts while additional police officers and soldiers will be deployed, according to Rio's city government.
The new plan follows a recommendation by local security chiefs to "further restrict the movement of people and close loopholes for possible terrorist attacks", the Globo newspaper reported. "The planning was altered and it will be changed again, if necessary," city government spokesman leonardo Maciel said.
An opening ceremony simulation drill will be conducted by security personnel at the Maracana on Sunday, he added, reports Xinhua.