London police chief Ian Blair says police have made what he calls "significant" progress in its investigation into last week's failed London subway bombings.

Investigators said Tuesday they found a large amount of suspicious material in a north London apartment connected to one of the four wanted suspects.

They have also seized a suspicious car parked near the apartment.

The suspects fled from three London subway stations and a bus when their bombs failed to explode on July 21st.

Police have identified two of the suspects as a British citizen from Eritrea and a Somali living legally in Britain.

Authorities are looking for a link between the July 21 attack and the July 7 London suicide bombings that killed 56 people.

Some information for this report provided by AP and AFP.