British Foreign Secretary Liz Truss walks through St. James s Park, central London, Friday, Jan. 14, 2022 after her comments that there is a deal to be done with the European Union over the Northern Ireland Protocol. U.K. AP
"My thoughts are with the Jewish community and all those affected by the appalling act in Texas," Foreign Secretary Truss posted on Twitter.
"We stand with the US in defending the rights and freedoms of our citizens against those who spread hate," she added.
US authorities have launched an investigation with "global reach" into a 44-year-old British man named as Malik Faisal Akram who was killed after holding four people hostage at the synagogue.
He was reportedly calling for the release of a convicted terrorist known as "Lady Al-Qaeda".
The four hostages -- including a respected local rabbi, Charlie Cytron-Walker -- were all released unharmed Saturday night. After the incident, the Jewish community and President Joe Biden renewed calls to fight anti-Semitism.
Police did not say whether the assault team killed the man or whether he killed himself.