Chemical-industry officials discussed the physical and technological anti-terrorism measures taken by chemical plants around the world at an event organized by the Brazoria County Petrochemical Council in Texas on Thursday. "We are prepared for everything that we can control," said Tim Scott, Dow Chemical's global director for emergency services and security. "We have layers of security around ... your critical assets. Then you put layers of security around the plant and layers of security around the community." The strongest defense against terrorism, officials said, was an alert community around the plant that would note and report suspicious activity.