The explosions took place at the two-storey residence of the Palestinian ambassador in the northern suburb of Suchdol.
According to local media reports, his family were in the building at the time but no-one else was injured in the blast.
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The cloud will then thicken from the west bringing outbreaks of rain and strong winds eastwards across the UK.
The note - which Flack was advised not to post - has been shared by her family and published in the Eastern Daily Press.
Employers have until January 1 2021 to meet the requirements and ensure their staff have a right to work in the UK.