Moreover, the very theory of the potential involvement of foreign intelligence in the 2014 ammo depot blast emerged only three weeks ago, Zeman revealed. Before that, such an idea had been never mentioned even in "non-public" reports by Czech intelligence services. Inept handling of ammunition remained the main theory of the cause of the blast. At the same time, it has been established that the cache of ammunition destroyed by the blast was destined for Bulgaria.

It certainly is notable that it's only now that this new theory comes into being; seven years after the blast, right after an escalation of hostilities by the US, and amidst a growing rift by the Baltic states against Russia. And it seems it has been building for a while, because, months before this baseless spat, Russia expelled a Bulgarian diplomat over spying accusations.

"The ammunition from the depot should have been delivered to Bulgaria," Zeman said. "There are trade invoices, a local arms dealer had made a deposit. We can consider the Bulgarian link confirmed."

© Reuters / David W Cerny
FILE PHOTO. A national flag of Russia flies on the Russian embassy in Prague, Czech Republic.

The ammo depot incident must be "thoroughly investigated," the president stated, expressing his full confidence in Czech police and security services.

"When the investigation is over, the citizens of the Czech Republic will be fully informed and nothing will be kept secret," Zeman said. "Whether this suspicion is justified, and in that case, while I support fair relations with all major countries, the Russian Federation needs to pay for this possible terrorist act - for example, Rosatom's non-participation in the Dukovany tender."

The Rosatom corporation has been already barred from the contest for the renovation of the Dukovany nuclear power plant, which is valued at $7 billion.

Moscow has strongly rejected the accusations, retaliating with the expulsion of 20 Czech diplomats, while Russian media reported looming economic sanctions against the Czech Republic. The spat has apparently entered a downward spiral, as Czech authorities now want to send home even more staff from Russian diplomatic facilities. Moscow, in turn, has signaled that such a move won't be left without a response, with talk emerging of restrictions on Czech exports, such as beer.

A White House official told Fox News Harris wasn't aware of the welcome packs, and that these kinds of efforts are usually organized by members of the community.

Health and Human Services could not be reached for comment on who is purchasing the books for the children.

More than 172,000 migrants were encountered by authorities in March alone. Among those were 18,890 unaccompanied children - a 100% increase from the already high numbers encountered in February, and the highest number recorded.

Smugglers have used groups of child migrants to divert Border Patrol so they can get adults through a different part of the border when officials are overwhelmed, while images of children being dumped at the border alone by smugglers have been released.