[Marricio]

pawn Code:

new Float:x, Float:y, Float:z;
GetPlayerPos( playerid, x, y, z );
z = 0.0;
GetPointZPos( x, y, z );
MoveObject(/*objectid*/, x, y, z, 2.0 );

//....
//public OnObjectMoved( objectid )
new Float:x, Float:y, Float:z;
GetObjectPos( objectid, x, y, z );
CreateExplosion( x, y, z, 4, 40 );
DestroyObject( objectid );

Just a quick one, not tested, maybe?