<p>Seoul: South Korea's joint investigation unit was probing the chief and vice-chief of the presidential security service over charges of obstruction of justice after it failed to execute an arrest warrant for President Yoon Suk Yeol in his residence on Friday, the <em>Yonhap</em> news agency reported.</p>.South Korea's Yoon, facing arrest over martial law, vows to 'fight until end'.<p>The two have been summoned for questioning on Saturday, the report added.</p>
<p>Seoul: South Korea's joint investigation unit was probing the chief and vice-chief of the presidential security service over charges of obstruction of justice after it failed to execute an arrest warrant for President Yoon Suk Yeol in his residence on Friday, the <em>Yonhap</em> news agency reported.</p>.South Korea's Yoon, facing arrest over martial law, vows to 'fight until end'.<p>The two have been summoned for questioning on Saturday, the report added.</p>