West Yorkshire Police released a video appeal in February over the fatal fire that left eight family members dead.
In the video there is a picture of Shalid Mohammed who has been wanted in relation to the arson attack since he skipped bail in 2003.
Siddiqah Aziz, who escaped the fire, told of the moment the blaze engulfed the house that left three generations of the same family dead.
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Thousands of people have linked hands on Westminster Bridge in a show of solidarity - one week after the terror attack in the capital.
PC Keith Palmer, 48, stabbed by Khalid Masood while on duty in the grounds of the Palace of Westminster last Wednesday.
Engineering firm CH2M won the £170 million contract but have pulled out of phase two of the project over alleged conflicts of interest.