Deputy Liberal Democrat leader Simon Hughes has congratulated Labour on their South Shields win.
The Lib Dems came seventh place in the by-election, speaking to Daybreak Mr Hughes said, "the Tories were always the challengers and they've been knocked out by UKIP."
He added: "We appear to be doing well in our territory and not giving that up."
More top news
Two students and their climbing instructor are feared dead after an avalanche hit a school party in Japan.
The US has strongly condemned Russia's treatment of protesters after the largest anti-government protests in years swept the country.
Prosecutors in South Korea are seeking a warrant to arrest former president Park Geun-hye on corruption allegations.