A police officer stands guard at South Station on April 19, 2013 in Boston, Massachusetts.(Kayana Szymczak/Getty Images)

• Boston and its adjacent suburbs remain under lockdown as the manhunt for 19-year-old Dzhokhor Tsarnaev, the Chechen immigrant suspected of committing Monday’s Boston Marathon attacks, continues. [Boston Globe]

• Tsarnaev’s uncle Ruslan Tsarni called on his nephew to turn himself in; the teenager’s aunt, Maret Tsarnaeva, insists he is innocent. [PBS]

• Julia Ioffe explains Chechens. [TNR]

• A number of Boston-area synagogues have canceled Friday night services in consultation with local police as resident are advised to continue sheltering-in-place. [Brookline PD]

• Meet Thomas Herndon, the UMass Amherst graduate student who debunked an enormously influential study supporting austerity economics by the Harvard professors Carmen Reinhart and Kenneth Rogoff. [NYM]

• In London, a freelance mathematician is vowing to continue fighting anti-Israel activities on British university campuses, despite losing a potentially landmark court case that charged an academics’ union of being institutionally anti-Semitic. [Times of Israel]