The death toll in a school collapse on Indonesia's main island of Java rose to seven on Friday after two bodies were pulled from the building's ruins, a rescue official said. Investigations into the cause of the collapse are continuing but initial signs pointed to substandard construction, experts have said. The rescue operation is complex because vibrations happening in one place can affect other areas, officials said. But the families of the missing agreed on Thursday for heavy equipment to be used. The rescue operation was complicated by an earthquake that struck overnight on Tuesday, briefly halting the search.