Mainly, the two tugs are going to help the Yantian Express at a position about 900 nm southeast of Halifax.
The newly-added tugs are the DonJon-owned Atlantic Enterprise and the Boskalis AHTS Sovereign, according to the U.S. Coast Guard.
The AHTS vessels Smit Nicobar and Maersk Mobiliser are already present and assisting.
Operator Hapag-Lloyd says that the fire is under control, because of the continuous progress under the direction of the salvage company Smit.
The Yantian Express is moving ahead at a 'slow speed'. However, Hapag-Lloyd does not yet have an estimate for the time of her arrival at a port of refuge. The full extent of the damage from the fire is currently unknown.