Relatives of soldiers killed in Iraq and Afghanistan may have been victims of News of the World phone hacking.
The Ministry of Defence was seeking clarification from Scotland Yard as sources said families of dead servicemen were being contacted by detectives over the scandal.
News International said it would be "absolutely appalled and horrified" if there was any truth in the allegations and it would be immediately contacting the MoD.
MPH Solicitors - whose clients include Samantha Roberts, widow of one of the first Britons killed in Iraq in 2003 - called for clarity from authorities over the claims.
Solicitor Geraldine McCool said the firm had been contacted by press on Wednesday over the allegations surrounding high-profile military inquests in 2006 and 2007. A statement on the firm's website said: "We are making efforts to verify this information."
A News International spokesman said: "Our titles have campaigned in support of the military over many years and will continue to do so. If these allegations are true we are absolutely appalled and horrified. We will be contacting the MoD immediately to try and verify the situation."
Ms McCool, a senior lawyer who represented Mrs Roberts and was instructed at the inquest of Lance Corporal Michael Pritchard, said there was no evidence to show confidential information was obtained through hacking. She added: "Whilst this developing story continues to shock and concern I confirm that I have never seen a news article that gave rise to concern that information had been obtained through illegal phone-hacking.
"Solicitors are cautious when leaving messages due to client confidentiality and my military clients and their families come from a background that works on a 'need to know' basis. I sincerely hope that any future revelations do not involve our clients and that full disclosure of the extent of this diabolical practice is now made."
Sgt Roberts, from Shipley, West Yorkshire, was accidentally shot dead by one of his own men when UK troops opened fire during a riot near Basra, just three days into the war.
An MoD spokesman said: "This is a matter for the Metropolitan Police who are investigating these allegations. It would be inappropriate for us to comment whilst this investigation is ongoing."
