[The bodies of Dawid Wlodarczyk, 3,
Monika Wlodarczyk, 35,
Maja Wlodarczyk, 11,
and Michal Wlodarczyk, 39 were found on Friday]
[The force described
it as "a terrible incident" and revealed that
no other parties were currently being sought.]
A battery Gas Leak checker
are cheap to buy.
This is one at £18
https://www.amazon.co.uk/Kidde-Year-...1zcF9hdGY&th=1