Undated combination handout police photo of the eight men on trial for planning to bomb airliners bound for U.S. and Canada

Two more defendants on trial in London on charges of plotting to bomb trans-Atlantic jetliners in 2006 have pleaded guilty to lesser charges.

All eight suspects in the case deny they were involved in any plan to smuggle liquid explosives onto passenger aircraft and set them off over the Atlantic.

But Defendants Arafat Waheed Khan and Waheed Zaman Monday pleaded guilty to a lesser charge under British law of - "conspiring to commit a public nuisance." 

Three other defendants pleaded guilty last week to charges of conspiring to cause explosions.

One of the eight defendants, Abdulla Ahmed Ali, has said he wanted to plant several small bombs in a Heathrow Airport terminal to publicize an anti-government documentary he was planning.

British prosecutors allege the suspects intended to carry out simultaneous suicide attacks on at least seven airliners flying from Britain to the United States.

Discovery of the alleged plot in 2006 seriously disrupted travel between the United States and Britain. It led to rules that now restrict the amount of liquids air travelers may carry.