SAO PAULO (AP) — Doubts surrounding the legality of the purchase of a small private plane used by the Brazilian Socialist Party have placed the campaign of presidential hopeful Marina Silva under scrutiny this week.

The Federal Police is investigating the ownership of a plane that crashed two weeks ago, killing Silva’s predecessor Eduardo Campos. The alleged purchase of the Cessna 560 XL by a group of businessmen close to Campos was not reported to the National Civil Aviation Agency, and now authorities investigating the crash are probing whether the transaction was legal.

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