Van believed to be carrying a terror suspect, arrives at City of Westminster Magistrates Court in London, Tuesday

British police have charged three more suspects with conspiracy to commit murder in the alleged plot to blow up passenger jets heading to the United States.

Mohammed Yasar Gulzar, Nabeel Hussain, and Mohammed Shamin Uddin are scheduled to appear before a London judge Wednesday.

This brings the number of suspects charged so far in the alleged terror plot to 15. Five others are still in custody while five have been freed. A number of suspects are also being held in Pakistan.

British authorities accuse them of planning to use liquid explosives to destroy as many as 10 airliners, killing thousands of people.

Police had been monitoring the suspects for months. Authorities made the arrests more than two weeks ago, believing the suspects were about to carry out their deadly plans.

Some information for this report was provided by AP and Reuters.