Three 18-year-old men from the Southampton area have been arrested on suspicion of murder, with one of them also arrested on suspicion of possessing stolen property.

Charges of producing the poison ricin and possessing terrorist materials were also put to him but, again, he did not respond and not guilty pleas were entered for him.

He was formally charged in Pennsylvania with forgery, carrying firearms without a licence, tampering with records or identification, possessing instruments of crime and providing a false identification to police.

In New York, he also faces two counts of carrying a loaded firearm, one count of possessing a forged instrument and one count of criminal possession of a weapon.

The firefighter is also being investigated for possessing child abuse imagery, as are four others, and faces 16 years in jail.