Dear Sir/Madam,

I am writing to inform you that I have lost my passport which contains my valid U.S. visa. The reason for the loss of my passport is due to an unfortunate incident that occurred during my recent travels. I was on a business trip to Europe and had my passport and other important documents in my backpack. Unfortunately, my backpack was stolen while I was sightseeing in a crowded tourist area. Despite my best efforts, I was unable to recover my backpack and its contents, including my passport.

I understand the seriousness of this matter and the implications of losing my passport, especially with regards to my U.S. visa. I have already contacted the local authorities and reported the theft, and have taken all necessary steps to obtain a police report. I have also informed my country's embassy in the country where the incident occurred and have requested their assistance in obtaining a new passport.

As soon as I return to my home country, I will apply for a new passport and will also apply for a new U.S. visa. I understand that this process may take some time, but I assure you that I will do my best to expedite the process and provide all necessary documentation to support my application.

I apologize for any inconvenience this may have caused and appreciate your understanding in this matter. I assure you that I am committed to following all necessary procedures to obtain a new passport and U.S. visa, and will provide any additional information or documentation that may be required.

Thank you for your attention to this matter.

Sincerely,

[Your Name]