TIRANA, Albania (AP) 鈥 Germany's foreign minister on Friday expressed the European Union鈥檚 deep concerns following the recent shootout between masked Serb gunmen and Kosovo police that left four people dead and sent tensions soaring in the region.

Annalena Baerbock was in Tirana, Albania at a foreign ministers' meeting ahead of the Oct. 16 summit on the to encourage six Western Balkans countries to keep working toward membership in the bloc.

The top diplomats of the six countries 鈥 Albania, Bosnia, Kosovo, Montenegro, North Macedonia and Serbia 鈥 are meeting with Baerbock, EU Enlargement Commissioner Oliver Varhelyi and other senior EU officials.

鈥淭he foundation for mobility in the region is security and safety,鈥 Baerbock said ahead of the meeting, adding that 鈥渢ensions within the last days between Serbia and Kosovo are also endangering this Berlin Process.鈥

鈥淭he key to resolving the conflict is in Belgrade and Pristina, though some may not be pleased to listen to that,鈥 she said.

On Sept. 24, around 30 heavily armed Serb men first killed a Kosovar police officer and then set up barricades in northern Kosovo before launching an hours-long gunbattle with Kosovo police.

Kosovo has against its former province, whose 2008 declaration of independence Belgrade doesn鈥檛 recognize. Serbia has denied this, saying that the gunmen acted on their own.

Meanwhile in Kosovo, Maj. Gen. Angelo Michele Ristuccia, the commander of the NATO-led peacekeeping force, called on both Kosovo and Serbia on Friday to return to the negotiating table to resolve their issues to prevent further violence. He urged both countries to 鈥渞efrain from inflammatory and counterproductive rhetoric and help to create the necessary conditions for lasting security.鈥

The six Western Balkan countries are at different stages of integration into the bloc. In 2013, Croatia, also a Western Balkans country, became the EU鈥檚 . Since then, progress has stalled and there is no clear timeline for membership.

Albanian Foreign Minister Igli Hasani said the October summit in Tirana will focus on proposals that will 鈥渟ignificantly improve the region's economic development鈥 with projects in transport, electronic development, telecommunication and raw materials.

鈥淚t aims at the revitalization of the European integration process," he told a news conference, and to better prepare countries for EU membership.

Baerbock said the Berlin process is crucial鈥 in promoting connectivity and cooperation in the region. She added that a key conference in Berlin in November on EU enlargement will try to 鈥渒eep the promises given a long time ago.鈥

The EU has not deemed the remaining Western Balkan countries鈥 economies and political institutions ready for integration into the EU鈥檚 single market of borderless trade and Western democratic ideals.

Varhelyi of the European Commission said some 15 billion euros ($15.8 billion) are to be invested in 54 major projects in the region. A new EU investment plan will try to 鈥渟peed up" economic programs and 鈥渉elp the region change鈥 even before EU membership.

The war in Ukraine has put integration of the Western Balkans high on the agenda as the EU works to reinvigorate its enlargement process. Ukraine is also seeking to join the bloc, along with Moldova and Georgia.

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