While all types of violence happen in the context of migration without state authorization, states have no directly tangible and clearly articulated incentives to protect migrants who travel in this way from violence. Migrants in transit, particularly those who travel informally without documents, are exceptionally vulnerable to exploitation from criminal gangs and smuggling networks, abuse by border forces, corrupt policing, and exposure to petty crime and violence during the journey.

The systems and structures that govern international migration without state authorisation create conditions of vulnerability for migrants, and sexual violence requires separate attention. Sexual violence in any context has unique causes and consequences and reporting follows distinct patterns, linked to different social meanings and gender dynamics. Thus, there is good reason for treating sexual violence differently from other more general forms of violence.

There is little or limited incentive for states to prevent sexual violence against migrants who might be travelling without authorization or be in the process of escaping adversity in their home state. These individuals who are not part of citizenry cannot easily call upon available mechanisms to report and seek support and retribution for crimes of sexual violence perpetrated against them. Yet, there is precedent to consider sexual violence an international ‘wrong’ and to advocate for the consolidation of action against it (for example in United Nations Security Council Resolution (UNSCR) 1825, which established sexual violence in conflict as warranting consolidated international action).

VISION researcher Alexandria Innes and Merili Pulleritis (City St George’s, University of London) conducted a systematic review and evidence synthesis to systematise and synthesize qualitative evidence of sexual violence experienced by migrants travelling without state authorization, during the course of their journeys. 

Their article, Sexual violence along migration routes: A qualitative systematic review and evidence synthesis, finds that sexual violence is widespread in the context of migration without state authorisation, and structurally embedded feature of undocumented migration. Findings were grouped around the six themes of agency, economics, climate of violence, normalisation of violence, perpetrators, and gender.

Data showed that migrant women expressed agency by adopting preventative or protective measures against expected sexual violence, at times including engagement in unwanted sexual contact. Economic deprivation intersected with sexual violence during migration journeys, increasing risk of sexual violence. The most severe cases of sexual violence were not mitigated by money. In some cases sexual violence victimisation was considered to be the only available way to prevent deportation or death.

Sexual violence was severe and indiscriminate, and included forced witnessing, and forced sex act perpetration on other migrants. Sexual violence along migration routes is executed by various types of perpetrators, including organised and systematic perpetration by state agents such as border guards and police, and by smuggling and trafficking gangs. Sexual violence is also carried out by opportunists who are often migrants in transit, or people who reside along the route. Sexual violence is used against men, women, trans and non-binary migrants, and people of all ages, but there are important gendered differences in the experience of sexual violence before and during a migration journey.

Sexual violence along irregular migration routes is an urgent issue demanding a response. Sexual violence is structurally embedded in the governance of international migration, suggesting the need for significant systemic change. This problem requires dedicated attention and resources directed towards prevention and protection.

To download the article: Sexual violence along migration routes: A qualitative systematic review and evidence synthesis

To cite: Innes, A., & Pullerits, M. (2026). Sexual violence along migration routes: A qualitative systematic review and evidence synthesis. PLOS ONE, 21(8), e0355474. https://doi.org/10.1371/journal.pone.0355474

For further information: contact Andri at alexandria.innes@citystgeorges.ac.uk