Building collapses are a recurring hazard in parts of India during the June-to-September monsoon, when heavy or prolonged rain can weaken ageing structures. A building collapsed in New Delhi on Sunday, killing at least one person and trapping several others, officials said. Key points and original sources are listed below.

• Building collapses are a recurring hazard in parts of India during the June-to-September monsoon, when heavy or prolonged rain can weaken ageing structures.S1

• A building collapsed in New Delhi on Sunday, killing at least one person and trapping several others, officials said. The five-storey building, which housed a boys’ hostel, collapsed in Satya Niketan, a densely populated neighbourhood known for its private stu...S2