The US State Department has a special website for American students traveling abroad, studentsabroad.state.gov , with information covering questions varying from what to do if you lose your passport, to how to vote from abroad.
The Department also regularly makes security recommendations. They come in many types but the key distinction is between a Travel Alert (a short-term warning) and a Travel Warning (a long-term warning). The Director and Assistant Director of SU London are part of the London Embassy’s Warden system, and will immediately pass on any alerts and information given out to this network.
The US Embassy encourages American citizens to register their travel plans on a secure website in case of an emergency. If you have not already done so, please register your details at travelregistration.state.gov .