WARSAW, Poland (AP) _ A Polish high school student said he held hostages on a bus and demanded to be flown to West Germany because he wanted to ''improve his living conditions,'' the state-run PAP news agency said Saturday.

The state prosecutor's office in Warsaw identified the bus hijacker as Artur Slupski, 18, from the village of Bodzentyn, 125 miles southeast of Warsaw, PAP reported.

It said ''Artur Slupski was ... motivated by his desire to improve his living conditions.''

Anti-terrorist police on Friday stormed the bus and captured Slupski, who was holding five hostages in the vehicle at Warsaw's airport.

Slupski detonated a grenade during the assault, wounding hostage Marek Losinski, 20.

The Polish evening television news Saturday broadcast a hospital bedside interview with Losinski, who suffered minor head injures.

''Before detonating (the grenade), he (Slupski) told me, 'Watch out Marek, we are dying,''' said Losinski. ''I remember the explosion was strong, and I don't remember what happened next.''

Official reports said the bus was attacked by police as it arrived in Warsaw from Staszow, about 90 miles to the south.

The hijacker demanded to be taken to Warsaw's Okecie Airport and then flown to Frankfurt in West Germany.

Maj. Jerzy Dziewulski, a member of the police anti-terrorist brigade, told a Polish television reporter on Saturday that he was able to get on the bus after it arrived at the airport by pretending to be a distraught New York- bound passenger who had lost his passport.

Police earlier had managed to negotiate the release of most of the hostages during several hours of talks. Five hostages remained when police stormed the bus.

''We were successful until the moment ... when the terrorist - realizing it was his end - pulled the detonating pin,'' said Dziewulski. ''It did not work. When he tried again, I aimed my pistol, but at that moment he covered himself behind the hostage and there was an explosion ... smoke. I overpowered him.''

Slupski has been accused of hijacking a bus and attempting to hijack a LOT Polish Airlines plane.