Lambs may also be spontaneously aborted or stillborn. Most such embryos are either naturally aborted or are stillborn upon delivery. This attempt was aborted after only two years. The 1975 failure was aborted after escape tower jettison. The flight controllers aborted his mission after only one day. Believing a collision had occurred, the copilot aborted the takeoff. Consequently, the reunion attempt was aborted. Because of boost surging, takeoff was aborted twice. However, the planned invasion was aborted. The operation was aborted due to problems with helicopter failures. Two other B-26s had aborted the mission after take-off. The planned resort was later aborted in August 2017. A pregnancy can be intentionally aborted in several ways. The film was aborted one day before production. Brucellosis can occur in humans who come in contact with infected aborted tissue or semen.