Oklahoma tornado was a monster, but it wasn't a record-breaker

Who's to blame for murky regulation in IRS scandal: Agency or lawmakers?

8:13 pm ET - In a Senate hearing, the two most recent IRS chiefs were grilled over why the agency failed for years to fix the law at the root of the political targeting scandal. The same could be asked of Congress, one said.

Exclusive: Iran's frontrunner for president speaks of his life battling US power

3:24 pm ET - Saeed Jalili, Iran's top nuclear negotiator, has declared his candidacy for the June 14 presidential election. The forever revolutionary is fiercely loyal to hardliner Ayatollah Ali Khamenei.

Greek PM invites China to 'join Greece's success story'

5:24 pm ET - Greece is rolling out the red carpet for Chinese investors as a means of stabilizing its shaky economy.

Russian confidence growing in its vision for ending Syrian war

2:03 pm ET - Russia's new tone of leadership on Syria is driven by momentum on the battlefield for Bashir al-Assad's forces.

• Terrorism & Security Syrian Army fires across border into Israel to retaliate for airstrikes

Decoder Wire IRS deliberately harassed conservatives, majority say in poll

2:21 pm ET - A new poll on the IRS scandal also finds that those who say the Obama administration is trying to conceal information outnumber those who say it's forthcoming. The tea party, meanwhile, is enjoying a 'bump.'

Burmese optimistic after historic White House visit

2:12 pm ET - Burmese are celebrating an end to their long international isolation with the first state visit to the US by a Myanmar president in almost 50 years.

Los Angeles votes in mayor's race without a clear front-runner

3:15 pm ET - The candidates in the Los Angeles mayor's race are both Democrats and have struggled to differentiate themselves. On Election Day, it's not at all clear which one might win.

Google, Apple draw transatlantic ire over 'double Irish' tax haven

2:06 pm ET - Big technology companies like Apple and Google are feeling heat on both sides of the Atlantic over their use of Irish corporate-friendly tax policies to pay little, if any tax.

• Decoder Wire Why Rand Paul thinks Senate is 'bullying' Apple Inc. (+video)

Tunisia shuts down medieval city to prevent Salafi demonstrations

5:00 pm ET - Tunisia's ruling Ennahda party began by reaching out to Salafist groups, but after fringe groups became increasingly violent, it changed gears, taking a hardline stance to reining them in.

Chinese premier visits India, talks up trade and trust

Premier Li Keqiang arrived this weekend in New Delhi on his first foreign trip. India has become China's biggest market for infrastructure contracts, but the two countries remain wary neighbors.

Are prayers before public meetings OK? Supreme Court to decide.

12:21 pm ET - Officials in Greece, N.Y., set up a system for prayers before town meetings. The US Supreme Court on Monday agreed to examine whether the practice violates the First Amendment's separation of church and state.

Backchannels Are tit-for-tat sectarian killings enough to tilt Iraq back to war?

5:15 pm ET - Bouts of sectarian fighting have worried observers many times over the past few years, but so far the worst has not come to pass.