The Hillsborough Law is facing a fresh delay over protection concerns.
A Public Office (Accountability) Bill introducing a duty of candour after the unlawful killing of 97 Liverpool was finally brought before Parliament in September last year.
However the government is prepare to hold up legislation after both MPs and campaigners raised issues that it may not fully hold security services accountable.
The bill’s remaining stages had been set to return to the House of Commons on Wednesday (January 14) but has been delayed amid calls for new amendments.
West Derby MP Ian Byrne and Knowsley’s Anneliese Midgley are among 20 Labour politicians to add their backing to the encompass intelligence officers in the law.
Families of the 2017 Manchester Arena bombing victims have raised the issue as those afforded public protection, such as MI5, may seek to mislead public inquiries.
In a letter to Keir Starmer, also signed by relatives of Halewood teenager Megan Hurley, they raised a failure to act on intelligence about bomber Salman Abedi
“MI5 failed our loved ones and failed us. It did so by failing to prevent the Arena bombing. But it then failed and hurt us further through its lack of candour after the attack,” they said in the letter to the Prime Minister.
“During the Manchester Arena inquiry, MI5 lied about the key intelligence it held about the suicide bomber before the attack.
“Despite MI5 lying to a public inquiry in this way, no one has been held to account.
“This lack of accountability needs to change. Creating a full duty of candour responsibility on MI5, MI6 and GCHQ is the clearest route to creating this change.”
Starmer is due to hear concerns from some bereaved families and Hillsborough campaigner Margaret Apinall, whose teenage son James died in the 1989 tragedy.
A spokesperson for the prime minister confirmed on Tuesday that further amendments were being considered by the government in light of the concerns.
However they insisted there would be no compromise to national security.
They said: “Since we introduced the bill, we’ve worked with the families to make this duty as strong as it can possibly be whilst never compromising on national security.
“This government will not bring forward legislation that would put the national security of the UK or lives at risk.
“On Friday, we brought forward a series of amendments to address concerns that the bill did not apply to individual employees of the intelligence agencies.
“But we’re determined to get this right.”