However, it appears to be an improvised device made with care and certain details suggest the maker was careful to reduce the risk of it being a dud.
Salman Abedi (inset) killed 22 people and injured at least 119 more when he detonated a bomb at Manchester Arena on Monday night as children were piling out of the venue having watched Ariana Grande.
"Look out for boasting, unsubstantiated claims, a lack of information about themselves and flashy or grandiose plans – if it all seems too good to be true, it probably is," says e Harmony.
The judge said: ‘After careful consideration of the facts, it appears to me that the violence to Ms Patel was inflicted in a frenzy of rage rather than enthusiasm for inflicting pain, suffering or humiliation, as sadism is defined in the Oxford English Dictionary.
Using data collected from Baihe, one of the largest dating websites in China, researchers from Binghamton University, University of Massachusetts Lowell and Northeastern University analysed the messages and how suitable each person actually was.
They say that in particular, males tend to be focused on their own interests and be oblivious toward their attractiveness to potential dates, while females are more conscious of their own attractiveness.