Baku, November 4, AZERTAC No pollution of seawater has been detected in connection with recent ship incidents, the Black Sea Basin Directorate in Varna said on its website. Bulgaria carried out pollution checks and reviewed its security response last Thursday after the drone-hit container ship Contship Jet sank in the Black Sea, while the European Commission expressed solidarity and condemned the attacks, the Bulgarian News Agency (BTA) reported.The vessel sank around midnight, Varna Regional Administration said. Three sea drones struck it on Wednesday about 21 nautical miles southeast of Shabla, east of Cape Kaliakra, in the fifth drone attack in Bulgaria’s exclusive economic zone this month. All 18 crew members, 14 Filipinos and four Ukrainians, were rescued and brought to Varna. Navy Commander Rear Admiral Kiril Mihaylov said 20 of its 421 containers had fallen overboard. The cargo included lithium-ion batteries and other hazardous materials.Samples collected on October 23 off Kaliakra and Byala showed no visible water pollution or opalescence during on-site inspections, the directorate said.Test results indicated a slightly elevated concentration of nitrate nitrogen near Byala, just above the permitted limit. The reading could not be linked to the ship incidents. All other tested parameters were within normal ranges.Tritium measurements from sampling points in Byala, Kaliakra and Sozopol, collected on October 9 and 14, were also below the detection limit.Results are still pending for a sample taken at the Sozopol coastal monitoring point on October 23, as well as for samples collected off Ropotamo 1 and Tsarevo 1 on October 26. Tests of samples taken on October 29 off Durankulak, Shabla, Kaliakra, Byala and Sozopol are also awaiting results.The directorate said further samples were scheduled to be collected on Wednesday at the monitoring points in Durankulak, Shabla, Kaliakra, Byala and Sozopol.