China is detaining Panama-flagged vessels in greater numbers amid an escalating row over terminals on either side of the Panama Canal, in what U.S. officials have described as a retaliation. Nearly 70 ships linked to the Central American country have been held for inspections at Chinese ports since March 8, according to a Thursday report by maritime analysis outlet Lloyd's List . Citing irregularities, Panama's Supreme Court in January voided the lease concession previously awarded to a