LONDON, May 24 (Xinhua) -- Two men were given life sentences on Thursday for murdering four children by setting fire to their home with petrol bombs in Britain in December.

A judge at Manchester Crown Court sentenced Zak Bolland, 23, and David Worrall, 26, to life-long jail, after convicting them of murdering four children.

Bolland was jailed for a minimum of 40 years and Worrall for 37 years.

The jury heard Bolland was high on drink and drugs when he torched the children's home after being motivated by a petty feud with the victims' 17-year-old brother.

The duo filled two glass bottles of petrol bought from a local garage, stuffing the tops with tissue paper as they prepared the attack.