WARSAW, Poland (AP) — The bodies of three foreigners were found Sunday at different locations near Poland's eastern border with Belarus and nine others have been hospitalized, the country's Border Guards said.

In one case, local police spokeswoman Edyta Pacuk told regional Radio 5 that residents picking mushrooms in the forest near Poland's border with Belarus and Lithuania came across three Iraqi men, one of whom was dead. The two other men were taken into police custody and hospitalized.

Border Guards spokeswoman Anna Michalska told The Associated Press that the bodies of two other foreigners were also found near the border with Belarus.

Prosecutors have opened investigations into the three deaths, the Border Guards said on Twitter.

In a separate incident, eight migrants — three women and five men — who got stuck in the swamps near Poland's border with Belarus were saved Sunday by the joint efforts of Poland's border guards, police, firefighters, military and airborne ambulance service, Michalska told Polish media. Seven of the migrants were taken to the hospital.

European Union members Poland and Lithuania are facing increasing migrant pressures on their borders with Belarus, which are part of the bloc's eastern border. They say it’s a “hybrid attack” by Belarusian President Alexander Lukashenko's regime in Minsk that is aimed at destabilizing the 27-nation EU.

Poland and Lithuania are building razor wire fences, have increased border patrols and have introduced a temporary state of emergency along their borders to stop illegal migration.

Michalska said over 3,800 attempts at illegal crossings from Belarus have been foiled so far in September, over 320 on Saturday alone.

Follow all AP stories on global migration at https://apnews.com/hub/migration.