frankfurt prosecutors tax authorities tuesday raid offices several senior officials volkswagen vowg_p.de german car-maker say investigators search offices supervisory board chairman hans dieter poetsch finance chief frank witter human resources head karlheinz bless volkswagen spokesman say file computers seize raid relate suspicions overpayments work council chief bernd osterloh spokesman say osterloh office also search neither work council prosecutor braunschweig immediately available comment person knowledge matter say tax authorities act suspicion tax evasion over-remuneration could result overly high operate expense payment little tax reveal early german prosecutors investigate current former executives volkswagen suspicion pay work council chief bernd osterloh excessive salary germany waste corporate fund legally breach fiduciary duty volkswagen say offices cfo hr chief chairman raid tax authorities prosecutors