The Ministry of National Defence (MApN) informed that on Monday evening, at 22:37, the radar surveillance system detected two aerial targets 25 kilometers north-west of the Snake Island, which were heading toward Romania's border.Two F-18 aircraft of the Spanish Air and Space Forces from the 57th "Mihail Kogalniceanu"Air Base took off to monitor the situation, according to a MApN release.The National Military Command Center notified the Inspectorate General for Emergency Situations (IGSU) regarding the implementation of measures to alert the population residing in northern Tulcea county.A RO-ALERT message was sent at 22:55.At 22:58, the targets disappeared from the radar, with explosions being reported on the Ukrainian side.No incursions into the national airspace were detected, the MApN mentioned. The radar surveillance system of the Ministry of National Defence (MApN) also detected an aerial target on Tuesday morning approximately 4 kilometres east of Vylkove , near the border with Ukraine, with two F-18 aircraft of the Spanish Air and Space Force, from the 57th "Mihail Kogalniceanu" Air Base, being scrambled to monitor the situation.According to a MApN release, the National Military Command Centre notified the Inspectorate General for Emergency Situations (IGSU) regarding the implementation of measures to alert the population in northern Tulcea County, which sent an RO-ALERT message at 07:31. The Inspectorate General for Emergency Situations (IGSU) on Tuesday morning issued an extreme alert to inform the population in the northern area of Tulcea County of the possibility of objects falling from the airspace, covering an estimated period of 90 minutes.In the message sent out around 7:30, the authorities urge people to keep calm and get shelter in cellars or civil protection shelters.In lack of shelter, citizens are advised to stay inside their home, away from windows and outside walls.