Greek authorities arrested an Egyptian man just before he entered the Athens metro with a hand grenade. The explosive device was reportedly delivered to him in a paper cup shortly before his capture. Police believe the man was preparing to carry out an attack, but the specific target remains unknown. An investigation is underway to identify and apprehend the mastermind behind the planned operation, who allegedly ordered the attack. Authorities are currently focusing on uncovering the motives for the planned bombing and any potential connections to wider terrorist networks. The arrest comes amid heightened security concerns in the region. Further details are expected to emerge as the investigation progresses.