MUMBAI, India — Relatives kept up a vigil Saturday at the site of a collapsed apartment building that killed at least 33 people in India’s financial capital Mumbai, as the search for survivors grew bleak.

Rudiben Parmar sat near the rubble Saturday, waiting for news of family members who were in the building. Three — a nephew and two of his children — had already been found dead. The nephew’s wife was rescued, but the couple’s young daughter was still missing.

The cause of Friday’s cave-in is not known, but area residents complained of shoddy building standards and lack of upkeep — with some expressing fear that their own buildings might be next.

It was the third deadly building collapse in six months in Mumbai, which like much of India has shoddy construction practices, lax inspections and corruption that can form a deadly combination.