You are in England & Wales and the person doing this is in the United States. You report at home, and at the same time trigger action where they actually are.
999 (call and ask for the police if you or someone else is in immediate danger or a crime is in progress). 112 also connects to the same emergency operator across the EU/UK.
Most people here are not in an active emergency. To start an official record, use the non-emergency steps below.
Keep doing everything below in England & Wales. At the same time, the fastest leverage often sits in the United States, where the person actually is.
The fastest practical levers against a U.S.-located perpetrator are: (a) platform reporting and content removal directly to the host service (the U.S. has no general government takedown order against a private individual's speech, and platforms have Section 230 immunity for user posts, so the platform's own abuse/terms process is the front-line removal tool); and (b) a state civil or criminal protective / restraining order (a stalking or harassment protection order, process varies by state), which once issued is enforceable against the U.S.-located respondent and makes any further contact a new, more readily charged offense. Where the conduct is interstate threats or cyberstalking, a U.S. federal case (18 U.S.C. § 875(c), § 2261A) opened via the FBI is the route to criminal action and to compelling evidence from U.S. providers.
A foreign victim whose harasser is located in the United States does not file with U.S. federal agencies from abroad and wait. The reliable inbound path is police-to-police: report the matter to your own national police / cybercrime unit in your home country and ask them to channel it to U.S. authorities. Two official conduits carry it: (1) INTERPOL, where your country's National Central Bureau transmits the request to INTERPOL Washington (the U.S. NCB inside the DOJ, the U.S. contact point for the 196-member INTERPOL network), and (2) a Mutual Legal Assistance Treaty (MLAT) or letter rogatory, the formal government-to-government request handled on the U.S. side by DOJ's Office of International Affairs, used to compel evidence such as subscriber records and content from U.S. platforms. U.S. platforms (where most of the abusive content sits) are themselves in the U.S., so a U.S.-based investigation or valid U.S. legal process is the lever that reaches them. In parallel, a victim can and should file directly with the FBI Internet Crime Complaint Center (https://www.ic3.gov) and the FBI tip line (https://tips.fbi.gov); IC3 accepts international complaints and may refer them to the appropriate U.S. or partner agency.
There is no single U.S. government body that will unmask an anonymous account or order a takedown on a foreign victim's request without a U.S. investigation or U.S. legal process. The most effective sequence is: preserve evidence (dated screenshots, URLs, usernames, headers), report to your home-country police so they can engage INTERPOL Washington / the MLAT process, file directly with the FBI/IC3, and pursue platform removal plus a state protective order against the named or identified U.S. perpetrator.
File a non-emergency report, and do the single most important thing: get your report / reference / occurrence number. That number is the key that unlocks platforms, prosecutors, employers and protective orders.
Use the online report form for non-emergency stalking, harassment, threats, defamatory/abusive content. For stalking/harassment many forces use a dedicated 'Report online' button that triages you to the right form. CRITICAL for a paper trail: at the end of the report ASK FOR and record the crime reference number / occurrence / log number; the report is handled by the control room the same as if you spoke to an officer. Keep screenshots and evidence.
Call 101 to report a non-emergency crime or get advice and to generate an official log. Ask for a crime/incident reference number. Also the route for Scotland fraud reporting (Police Scotland).
Anonymous reporting if you do not want to give your details. NOTE: This does NOT create a victim crime report or give YOU a personal crime reference number, so it is not the channel for starting your own official paper trail; use 101 or local-force online report for that.
Use for fraud, online extortion/sextortion demanding money, identity fraud/identity theft, and cyber-dependent crime. Generates a reference number for your paper trail. Covers England, Wales and Northern Ireland; Scotland callers report to Police Scotland on 101. Report Fraud went live 4 December 2025 with Action Fraud traffic redirecting and a full public launch in January 2026.
File here in addition to, not instead of, your local police report.
INTAKE + TRIAGE + INTELLIGENCE, generally NOT a direct investigator of individual reports. National reporting front door for fraud and cyber-crime (replaced Action Fraud; full public launch January 2026, redirects began 4 Dec 2025). Reports are assessed by the Report Fraud National Crime Analysis Service (N-CAS) and disseminated to local forces or specialist units; serious/complex cases are flagged for investigation. A victim support service is provided. Phone unchanged from Action Fraud (0300 123 2040).
Investigates the most serious and organised cyber-crime; leads, supports and coordinates the UK response to serious/organised crime including cybercrime and economic crime that crosses borders. The public does NOT report routine cybercrime directly to the NCA - the NCA directs victims to local police (101/999) or Report Fraud; it acts on intelligence and serious-organised-crime cases, not individual intake.
INTAKE + TECHNICAL TAKEDOWN, not a criminal investigator of harassment. Receives reports of scam/phishing emails, texts and websites; can investigate and remove malicious sites and shares intelligence with the NCA and City of London Police. Not the channel for harassment/threats/doxxing - it is for scam/phishing infrastructure.
PLATFORM REGULATOR, NOT an individual-complaint body and does NOT investigate your specific case or give you a personal remedy. Regulates social-media and search platforms' duties to remove illegal content (including harassment, threats, intimate-image abuse). Can fine platforms up to 10% of qualifying worldwide revenue (or 18 million pounds, whichever is greater) and, in extreme cases, seek court orders to block a service. Victims still report the crime to police; Ofcom handles systemic platform compliance. Illegal-content duties live since 17 March 2025.
This page covers the cross-border part. For the full England & Wales guide, the exact offences to name with official statute links, and the escalation ladder, see Reporting online harassment in England & Wales →