The family is thought to have been forced from their home in the community and held prisoner in Gaza.
The UK Foreign Office has declined to comment.
‘This is just the beginning,’ Netanyahu said in a televised address. ‘We will destroy Hamas.’
The Gaza strip has a long history of conflict.
Her mum and four siblings were killed by an Israeli air strike.
Israeli bombs killed at least 10 women and eight children in Gaza City on Sunday morning.
Some demonstrators climbed up onto scaffolding and waved huge Palestinian flags.
WARNING: This article contains distressing images and content.
At least 35 Palestinians have been killed including 12 children as hostilities between Israel and Hamas heads towards an ‘all-out war’.
Pro-Israeli counter-demonstrators were escorted by police to chants of 'shame on you'.
The two fought a civil war in 2007.
A Palestinian baby who was born after her mother was killed in an Israeli attack on Gaza has died.
Gaza City zookeepers have found a creative way of drawing crowds to their dilapidated zoo - by painting their donkeys.
Gaza City zookeepers have found a creative way of drawing crowds to their dilapidated zoo - by painting their donkeys to look like zebras.
Bodies are piling up on hospital floors and supplies of fresh water and food are running out, aid workers in Gaza have reported.