Detectives are questioning a 43-year-old man about the deaths of two people found at a block of flats in the West Midlands.
Police arrested the suspect at the scene on Saturday after conducting house-to-house enquiries.
More top news
The 53-member body agreed that Prince Charles should succeed the Queen as the next commonwealth head.
Mary Ragoobeer and her sons, Shane and Sean, were killed in the blast in Leicester on February 25.
Wiltshire Council has warned work to remove toxic traces from nine hot spots around the city could take months.