MADRID – Authorities in Spain released a video Saturday that they claim shows suspected al-Qaida members training for a bombing raid using a model plane, the latest development in a case that has led to three arrests.

Spanish officials allege the suspects were planning a terrorist attack in Spain or elsewhere in Europe, but say investigators managed to intercept them before they could carry out their plot.

The undated video clip – grainy and of low quality – shows a colorful model propeller plane noisily taking off. Once airborne, it drops a small object that falls to the ground and a man then runs toward where the object landed. The identity of the man is not clear from the clip.