The heartbroken widow of murdered Tasawar Hussain broke down as she made a plea to catch the killers of her "wonderful, brave" husband.

Pregnant Naila Hussain, 34, was comforted by members of her family as she made the desperate appeal for help at a lunchtime press conference. Choking back tears, Naila said Tasawar's murderer had "broken her heart".

She said the killer had taken her husband "from my beautiful daughter, from me."

"Whoever did this has broken my heart. I want them found. We miss him so much. He was such a wonderful person. We were making plans for our baby, our child, when he was murdered."

Naila, who has been left to care for the couple's five year-old daughter, Harisa, alone, said: "Nobody knows what we are going through."

Close to breaking down completely and with her sister Naida Ali's arm around her shoulders, the widow added: "Please help us find them - please."

Naila, who was dressed in black trousers, blue denim coat and pink scarf, stared at the floor as she bravely faced a packed press conference to make her appeal. And she declared her 36-year-old husband had done what "any ordinary, decent human being would have done."

She said: "I can't fault him for what he did. He was the most wonderful person in the world. He was just decent, he would do anything for anybody. He just made sacrifices. He did something on instinct and he paid for it."

The man in charge of the murder hunt, Detective Superintendent Allan Doherty, made an impassioned plea to members of the criminal fraternity to help nail Tasawar's killers. And he warned them to come forward before police came knocking on their doors.

Det Supt Doherty said: "I am appealing for members of the criminal fraternity in Bradford and West Yorkshire to come to the police in confidence if they have any information about this offence. The criminal community has its own set of values. Anyone with any shred of decency will not countenance what has happened - a man has been shot down in cold blood.

"Anyone who knows anything about this terrible crime or who has any idea of the sort of person responsible should ring us - but make it quick. I can assure them intense police activity will now commence. We know from experience that when we conduct a murder investigation we always unearth evidence of other crimes and criminals not connected with the matter."

Det Supt Doherty said police were hoping to fly a crucial witness back to Britain from Pakistan whom he believes could help with an e-fit of the killers. And he urged the public to come forward, saying he was disappointed with the number of people who had contacted them so far.

He said: "I would have expected to have hundreds of calls from the public, but we have only had about 50."

Anyone with information should call the incident room on (01274) 373130.