TOKYO, July 21 — Japan's ruling coalition lost its majority in the House of Councillors in Sunday's election, an outcome that will add pressure on embattled Prime Minister Shigeru Ishiba, who vowed to stay on despite yet another heavy blow to his party, Kyodo News Agency reported.

TOKYO, July 20 — Japanese voters could unleash political turmoil as they head to the polls on Sunday in a tightly contested upper house election, with rising prices and immigration concerns threatening to weaken Prime Minister Shigeru Ishiba's grip on power.