A boat carrying six scientists of the Waltair-Vishkhapatnam-based regional centre of National Institute of Oceanography in Panaji was attacked off the Yermal coast in Karnataka's Udupi district. No one was injured in the incident. The attackers, boarding two canoes, alighted into the NIO boat two days ago and took away geo-physical survey instruments after a brief scuffle with the scientists, a NIO spokesman said in Panaji on Wednesday.